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| 1 | Pollen-inferred Holocene vegetation and climate histories in Taro Co,southwestern Tibetan Plateau显示文摘A 310-cm-long sediment core,covering the last10,200 years,was collected from Taro Co on the southwestern Tibetan Plateau and analyzed for pollen,grain size and total inorganic carbon content.The pollen data showed that vegetation changed from alpine steppe to alpine meadow during 10,200–8,900 cal a BP,to alpine steppe dominated by Artemisia during 8,900–7,400 cal a BP,to alpine meadow during 7,400–3,300 cal a BP and to alpine steppe after 3,300 cal a BP.Correspondingly,the pollen,grain size and total inorganic carbon content results revealed climatic change in this area over four stages.The initial stage was from 10,200 to 8,900 cal a BP,during which the climate changed from cold-dry to warm-humid.The second stage(8,900–7,400 cal a BP)was characterized by a warm and dry climate.However,at approximately7,400 cal a BP,the climate began to become cold and humid,which continued until 3,300 cal a BP.The last stage,from 3,300 cal a BP to present,was characterized as cold and increasingly arid.Climatic events of the early and mid-late Holocene showed that the area was significantly affected by the westerlies.However,the mid-Holocene climate in Taro Co was controlled by the Indian monsoon.The mid-late Holocene depositional environment record of Taro Co was very important to further elaborate the degree of influence by the westerlies or Indian monsoon. | Qingfeng Ma Liping Zhu Xinmiao L Yun Guo Jianting Ju Junbo Wang Yong Wang Lingyu Tang | 2014 | Chinese Science Bulletin2014，59，31： | 7 |
| 2 | Modulation of Sex Expression in Four Forms of Watermelon by Gibberellin, Ethephone and Silver Nitrate显示文摘There has been no systematic research on the effect of plant growth regulators and silver nitrate treatments on the control of sex expression in watermelon. In this study, we tested sex expression responses of four watermelon forms(monoecism, gynoecism, andromonoecism,and hermaphrodite) to gibberellin, ethephon and silver nitrate treatments. Results have shown that, in monoecious plants, gibberellins(GA_3)and ethephon treatments reduced the percentage of female flowers and delayed the occurrence of the first female flower, while silver nitrate induced the formation of bisexual flowers. In gynoecious plants, both ethephon and silver nitrate treatments transformed some female flowers into bisexual flowers, and treatment with ethephon resulted in a mass of abnormal flowers, while no obvious effect of treatment with GA_3 was observed. In andromonoecious plants, ethephon and GA_3 treatments delayed the occurrence of the first bisexual flower, and GA_3 reduced the percentage of bisexual flowers, while no distinct effect for silver nitrate treatment was observed. In hermaphroditic plants, ethephon treatment induced the appearance of numerous abnormal flowers, while no obvious effects for GA_3 and silver nitrate treatments were observed.We analyzed the transcription levels of all the expressed aminocyclopropane-1-carboxylic acid synthase(ACS) homologues in two gynoecious mutants and their wild types. We also tested the gene expression of CitACS4 which had been recognized as the andromonoecious gene in all treatments. All these results suggested that the best masculinizing treatment for breeding of the gynoecious line is silver nitrate, which repressed the expression of CitACS4 and induced many bisexual flowers for use in self-fertilization subsequently. | ZHANG Jie SHI Jianting JI Gaojie ZHANG Haiying GONG Guoyi GUO Shaogui REN Yi FAN Jianguang TIAN Shouwei XU Yong | 2017 | Horticultural Plant Journal2017，3，3： | 6 |
| 3 | Evolution of Microstructure and Mechanical Property during Long-Term Aging in Udimet 720Li显示文摘Thermal stabilities of microstructure and mechanical property have been investigated on super- alloy U72OLi, which is of great interest of application for jet engine and land-based turbine disc. The results showed that, the primary and secondary γ’?particles maintain good thermal stability at 650 and 7000C with aging time up to 3000 h, while the tertiary γ’?is apparently dependent on aging temperature and time. The tertiary γ’?particles undergo a procedure of coarsening, dissolution and eventually complete disappearance with the increasing of aging time and temper- ature. They exhibit unusual high sensibility upon aging temperature, which is attributed to the lattice misfit between the γ’?precipitates and the matrix in the alloy. The grain boundary phase M23C6 remains stable without forming of sigma phase even with aging time up to 3000 h at 700℃. Microhardness decreases apparently with increasing aging time and aging temperature. Theoretical analysis based on dislocation mechanism indicates that the change of microhardness should be attributed to the evolution of the tertiary γ’?during aging. | Lanzhang ZHOU and Valentino LUPINC CNR-TeMPE, Via R. Cozzi 53, 20125 Milano, Italy Jianting GUO Institute of Metal Research, CAS, 72 Wenhua Road, Shenyang 110016, China | 2001 | Journal of Materials Science & Technology2001，17，6： | 6 |
| 4 | Wear properties of NiAl based materials | Jianting Guo Zhensheng Wang Liyuan Sheng Lanzhang Zhou Chao Yuan Zhigang Chen Li Song | 2012 | Progress in Natural Science:Materials International2012，22，5： | 3 |
| 5 | Effect of Nb on the Microstructure and Mechanical Properties of Cast NiAl-Cr(Mo) Eutectic Alloy显示文摘微观结构和 NiAl-28Cr-5Mo-lNb 最容易溶解的合金的机械行为被使用分别地扫描电子显微镜学, X 光检查衍射,传播电子显微镜学和耐压试验调查。合金主要由三个阶段组成,它连续地是灰色的薄片状的 Cr (瞬间) 板,黑 NiAl 矩阵和半 distributedCr_2Nb 类型洗阶段。通过 1Mb 增加, NiAl-Cr (瞬间)/Nb 合金展出高温度力量和房间温度压缩韧性的合理平衡,它的机械行为根本比 NiAl-28Cr-6Mo 最容易溶解的合金优异温度。NiAl-Cr (瞬间)/Nb 合金的提高的温度压缩变形行为能被 power-lawequation 适当地描述。 | Kaiwen HUAI Jianting GUO Zirong REN Qiang GAO Rui YANG | 2006 | Journal of Materials Science & Technology2006，22，2： | 3 |
| 6 | High Temperature Creep and Fracture Behavior of a Directionally Solidified Ni-base Superalloy显示文摘DZ17G 的张力的蠕升破裂性质,一个方向联盟者团结了超级合金,在 830-900 度 C 被调查。所有蠕变曲线展出的结果表演可以忽略主要 creep,几乎相对别稳定 -- 说 creep 和主导的第三级的 creep 舞台。为 creep (540 kJ/mol ) 的更高明显的活化能建议 creep 被弯过程的 Orowan 控制。tertiary 的时间爬的发作的破裂时间的大比率是微观结构变化的后果,即,鲸鱼群妈“粒子面向的变粗平行到应用压力轴。creep 破裂数据跟随 Monkman- 资助关系。根据 metallographic 考试建议的 transgranular 破裂机制是与微观结构在断绝开始的creep 裂缝的连接(例如演员组,孔,和碳化物/矩阵连接)并且另外在标本表面,沿着鲸鱼群妈/鲸鱼群妈宣传“的接口对快克的应用压力轴,和这进程垂直繁殖能被 Tien 模型描述。(编辑作者摘要) 31 个裁判员。 | Yuan, Chao Guo, Jianting Wang, Shuhe Yang, Hongcai | 1998 | Journal of Materials Science & Technology1998，14，3： | 3 |
| 7 | Mechanical Properties of DS NiAl/Cr(Mo) Alloys with Low Addition of Hf for High-temperature Applications显示文摘A multiphase NiAI-28Cr-5.85Mo-0.15Hf alloy, which was directionally solidified (DS) in an AI2O3-SiO2 mold by stan-dard Bridgman method and then underwent prolonged solution and aging treatment was prepared. The microstruc-ture, tensile properties as well as tensile creep of the heat-treated alloy at different temperatures were studied. Thealloy was composed of NiAl, Cr(Mo) and Hf-rich phase and small amount of fine Heusler phase (Ni2AIHf). Althoughthe present alloy exhibited high tensile strength at low temperature, it was weaker than that of system with highcontent Hf but still stronger than that of many NiAI-based alloys at high temperatures. The fracture toughness islower than that of DS NiAI-28Cr-6Mo alloy. Nevertheless, advantageous effects on the mechanical properties, i.e.the decrease in brittle-to-ductile transition temperature (BDTT) were obtained for the low content of Hf. The ob-tained creep curves exhibit conventional shape: a short primary creep and long accelerated creep stages. The ruptureproperties of the heat-treated alloy follow the Monkman-Grant relationship, which exhibits similar creep behavior tothat of NiAI/Cr(Mo) system with high Hf content. | Xinghao DU Jianting GUO | 2005 | Journal of Materials Science & Technology2005，21，5： | 2 |
| 8 | Effect of hot isostatic pressing on microstructure of cast gas-turbine vanes of K452 alloy显示文摘The effect of hot isostatic pressing(HIP) treatment on microstructure of gas-turbine vanes made of K452 alloy was investigated by OM,SEM and TEM. The results showed that HIP treatment played a great role in the porosity healing processing, where 80% of porosities were eliminated and the diameter of remnant porosities decreased to 10 μm. The healing mechanism of the porosities was consistent with existing theories of porosity closure based on vacancy diffusion. According to the result of the tensile test, the plasticity of the alloy was improved as the result of the elimination of the porosities and the improvement of dendritic segregation, while there was not an obvious improvement in the tensile strength after the programmed HIP process. In addition, HIP had a positive effect on narrowing down the dispersion of tensile properties. | Jie Li Chao Yuan Jianting Guo Jieshan Hou Lanzhang Zhou | 2014 | Progress in Natural Science:Materials International2014，24，6： | 2 |
| 9 | Microstructures and Creep Behavior of a Directionally Solidified NiAl-Fe(Nb) Multiphase Intermetallic Alloy显示文摘The microstructure and creep behavior of a DS NiAl-Fe(Nb) multiphase intermetallic alloy have been investigated. This alloyexhibits dendritic structure, in which dendritic arm isβ-(Ni,Fe)(Fe,Al) phase surrounded by interdendritic region ofγ'/γ phase.The results of the creep test indicated that all of the creep curves have similar characteristic, which is a short primary creepstage and a dominant steady state creep stage, and the creep strain ranges from 18% to 52%. The apparent stress exponentand the apparent activation energy were analyzed and discussed. The mechanism of the creep deformation was also analyzedby the observation of TEM. | Yihui QI, Jianting GUO and Chuanyong GUIDepartment of Superalloys, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China | 2003 | Journal of Materials Science & Technology2003，19，1： | 2 |
| 10 | Effect of high magnetic field on the primary dendrite arm spacing and segregation of directionally solidified superalloy DZ417G显示文摘 | Tao Zhang Weili Ren Jianwen Dong Xu Li Zhongming Ren Guanghui Cao Yunbo Zhong Kang Deng Zuosheng Lei Jianting Guo | 2009 | Journal of Alloys and Compounds2009，，1： | 2 |
| 11 | Mechanism of Macroalloying-induced Ductility in Ni_3Al显示文摘The bonding characteristics of Ni3Al doped with ternary elements has been investigated by means of the discrete variational Xα (DV-Xα) cluster method. From the computations. the addition of ternary element M (M= Pd. Ag. Cu and Co) substituting for the Ni sttes leads to the increase of delocalized bonding electrons. and the mechanism of ductilization of Ni3Al bV doping with M is explained based on the analysis of bonding characteristics. The increase of delocalized bonding electrons lowers the covalent bond directionality and strengthens grain boundary. The difference of strength between M-Al bond and M-Ni bond is an important factor in the effect of alloy stoichiometry on ductility. The larger the difference. the more the sensitivity to the alloy | Changgong MENG Jianting GUO and Zhuangqi HU (Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110015, China)(To whom correspondence should be addressed) | 1994 | Journal of Materials Science & Technology1994，10，4： | 2 |
| 12 | Zirconium-Induced Softening in Hyperstoichiometric Ni_3Al显示文摘The room temperature compressive properties and microhardness of Ni3Al alloys doped with Zr were studied. For the hypostoichiometric Ni3Al alloys, the compressive strength and microhardness increased with an increase in Zr content, while softening behavior induced by doping with a certain amount of Zr was observed in hyperstoichiometric Ni3Al alloy. Possible mechanisms for the softening effect were suggested. | Yufang LI, Jianting GUO and Hengqiang YE Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China | 2005 | Journal of Materials Science & Technology2005，21，2： | 2 |
| 13 | MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Fe-Ni-Co-BASE SUPERALLOY AFTER LONGTERM AGING AT 650℃显示文摘The microstructure and mechanical properties of a Ni-Fe-Co base superalloy with lowthermal expansion coefficient after aging at 650℃ for 200,500,1000 and 2000 h have beeninvestigated.It was found that they are stable at 650℃.This alloy is believed to.fill the re-quirements for long time service to aircraft engine. | WANG Shuhe GUO Jianting LAI Wanhui GE Yunlong TAN Minghui LI Hui Institute of Metal Research,Academia Sinica,Shenyang,China | 1991 | Acta Metallurgica Sinica(English Letters)1991，4，3： | 2 |
| 14 | Effects of Nb and Si on densities of valence electrons in bulk and defects of Fe3Al alloys显示文摘 | Wen Deng Xiaping Zhong Yuyang Huang Liangyue Xiong Shuhe Wang Jianting Guo Qiwei Long | 1999 | Science in China Series A: Mathematics1999，，1： | 1 |
| 15 | Effects of Nb and Si on densities of valence electrons in bulk and defects of Fe3Al alloys显示文摘 | Wen Deng Xiaping Zhong Yuyang Huang Liangyue Xiong Shuhe Wang Jianting Guo Qiwei Long | 1999 | Science in China Series A: Mathematics1999，，1： | 1 |
| 16 | Effects of Nb and Si on densities of valence electrons in bulk and defects of Fe3Al alloys显示文摘 | Wen Deng Xiaping Zhong Yuyang Huang Liangyue Xiong Shuhe Wang Jianting Guo Qiwei Long | 1999 | Science in China Series A: Mathematics1999，，1： | 1 |
| 17 | Preliminary Investigation of NiAl-TiB_2 Composite Prepared by Reaction Milling显示文摘 | Lanzhang ZHOU and Jianting GUO(Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China To whom correspondence should be addressedE-mail: lzz@imr. ac .cn ) | 1999 | Journal of Materials Science & Technology1999，15，5： | 1 |
| 18 | MICROSTRUCTURE AND MECHANICAL PROPERTIES OF A Ni_3Al-Fe BASED ALLOY显示文摘The microstructure,tensile properties at 20—950℃ and creep rupture properties at 700-900℃ in a Ni3Al-Fe based alloy after high temperature deformation have been studied.Theresults show the microstructure of the alloy is composed of γ′-and β-phases.The grain sizeand yield strength of the alloy is stable when the temperature≤600℃,and it is ductile athigh temperature.The creep of the alloy at 700—900℃ is controlled by the climbing of dislo-cations,and the activation energy for creep is 439 KJ/mol with a stress exponent of 4. | LI Hui GUO Jianting TAN Minghui SUN Chao LAI Wanhui WANG Shuhe Institute of Metal Research,Academia Sinica,Shenyang,China Professor,Institute of Metal Research,Academia Sinica,Shenyang 110015,China | 1993 | Acta Metallurgica Sinica(English Letters)1993，6，1： | 1 |
| 19 | EFFECT OF Zr ON DUCTILITY OF CAST Ni_3 Al-BASE ALLOYS显示文摘Many compressive and tensile tests showed that the room temperature ductility of boron-freeNi3Al alloy may be markedly improved by a moderate addition of Zr.The ductility of thestoichiometric Ni3Al and even slightly enriched with Al,may be improved fairly between 400—600℃,which behaves much better if Zr is added together with B.However,the high tem-perature ductility of Ni3Al alloys containing Cr may be significantly increased by Zr whichsegregates slightly along grain boundaries.Thus,the toughening mechanism of Zr alloyingseems to be different from that of B addition. | ZHENG Zhi WU Weiwen GUO Jianting ZHU Yaoxiao Institute of Metal Research,Academia Sinica,Shenyang,China Institute of Metal Research,Academia Sinica,Shenyang 110015,China | 1992 | Acta Metallurgica Sinica(English Letters)1992，5，6： | 1 |
| 20 | Formation Mechanism of NiAl/TiB_2 Nanocomposite by Mechanical Alloying Elemental Powders显示文摘A NiAl/TiB2 nanocomposite is synthesized by mechanical alloying elemental powders. Upon milling for a certain time, an abrupt exothermic reaction occurs and a large amount of NiAl and TiB2 compounds form simultaneously. It is suggested that two separate chemical reactions,i.e. Ni+Al →NiAl and Ti+2B→TiB2, are involved during the exothermic reaction. Additionof Ti and B to Ni-Al system impedes the structural evolution of Ni and Al powders and delays the abrupt reaction. The final products are equilibrium phases without any metastable phases formed. This type of reaction is suggested to be suitable for alloy systems with two large heatrelease reactions. | Lanzhang ZHOU and Jianting GUO(Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China) | 1998 | Journal of Materials Science & Technology1998，14，6： | 1 |
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