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| 1 | Analysis of abnormal texture formation and strengthening mechanism in an extruded Mg-Gd-Y-Zn-Zr alloy显示文摘A Mg-Gd-Y-Zn-Zr magnesium alloy with different initial states was extruded under different extrusion parameters.The effect of solution treatment and extrusion parameters on the microstructure,texture and mechanical properties were analyzed in detail,and the abnormal texture formation and strengthening mechanism was revealed.When extruded at low temperature and small extrusion ratio,the bimodal microstructure consisting of fine dynamically recrystallized grains and coarse deformed grains occurred both in the as-cast alloy and solution-treated alloy.When the extrusion temperature and extrusion ratio were increased,the amount and size of dynamically recrystallized grains increased and the grain size of the solution-treated alloy showed higher growth rate.Furthermore,an abnormal texture with<0001>parallel with extrusion direction developed due to the occurrence of non-basal slip and continuous dynamic recrystallization.This could be enhanced by solution treatment,high temperature,and large extrusion ratio.Both the as-cast alloy and solution-treated alloy exhibited the highest tensile strength after extrusion at 300℃with an extrusion ratio of 9.Grain refinement was the main strengthening mechanism utilized in both the as-cast alloy and the solution-treated alloy.Work hardening played an important role in the sample extruded at low temperature and small extrusion ratio,with the highest contribution of about 33 MPa after extrusion at 300℃with an extrusion ratio of 9.Texture strengthening contributed more in the sample extruded at high temperature and large extrusion ratio,but no more than 24.1 MPa.Solution strengthening was another strengthening mechanism in the extruded as-cast alloy,especially at high temperature and large extrusion ratio(no more than 9 MPa). | Xueze Jin Wenchen Xu Zhongze Yang Can Yuan Debin Shan BugangTeng Bo Cheng Jin | 2020 | Journal of Materials Science & Technology2020，42，10： | 7 |
| 2 | Statistical inference for zero-and-one-inflated poisson models显示文摘In this paper, a zero-and-one-inflated Poisson (ZOIP) model is studied. The maximum likelihoodestimation and the Bayesian estimation of the model parameters are obtained based on dataaugmentation method. A simulation study based on proposed sampling algorithm is conductedto assess the performance of the proposed estimation for various sample sizes. Finally, two realdata-sets are analysed to illustrate the practicability of the proposed method. | Yincai Tang Wenchen Liu Ancha Xu | 2017 | Statistical Theory and Related Fields2017，1，2： | 5 |
| 3 | NUMB enhances Notch signaling by repressing ubiquitination of NOTCH1 intracellular domain显示文摘The release and nuclear translocation of the intracellular domain of Notch receptor(NICD)is the prerequisite for Notch signaling-mediated transcriptional activation.NICD is subjected to various posttranslational modifications including ubiquitination.Here,we surprisingly found that NUMB proteins stabilize the intracellular domain of NOTCH1 receptor(N1ICD)by regulating the ubiquitin–proteasome machinery,which is independent of NUMB’s role in modulating endocytosis.BAP1,a deubiquitinating enzyme(DUB),was further identified as a positive N1ICD regulator,and NUMB facilitates the association between N1ICD and BAP1 to stabilize N1ICD.Intriguingly,BAP1 stabilizes N1ICD independent of its DUB activity but relying on the BRCA1-inhibiting function.BAP1 strengthens Notch signaling and maintains stem-like properties of cortical neural progenitor cells.Thus,NUMB enhances Notch signaling by regulating the ubiquitinating activity of the BAP1–BRCA1 complex. | Zhiyuan Luo Lili Mu Yue Zheng Wenchen Shen Jiali Li Lichao Xu Bo Zhong Ying Liu Yan Zhou | 2020 | Journal of Molecular Cell Biology2020，12，5： | 2 |
| 4 | Combination of eddy current and heat treatment for crack healing and mechanical-property improvement in magnesium alloy tube显示文摘The continuous eddy current pulse treatment(ECPT)combined with heat treatment was employed to heal the microcracks in spin formed Mg alloy tubes and improve their mechanical properties in this study.The results show that all the microcracks in different tube specimens were almost healed after different continuous ECPT schemes up to 15 cycles.The schemes with less cooling intervals exhibited better healing effect and increased the strength and elongation of Mg alloy tubes more obviously.After aging treatment,the strength improvement of the specimens with ECPT was more remarkable than that of the specimens without ECPT,and the elongation decrease of the specimens with ECPT was less evident than that of specimens without ECPT due to the segregation of RE elements on the crack surface.Besides,after solution treatment,the strength reduction and ductility improvement of the specimens with ECPT were more pronounced than that of the specimens without ECPT owing to the notable decrease of dislocation density of the specimens with ECPT.Both narrowed cracks induced by ECPT and the segregation of precipitates in the vicinity of microcrack surface during aging treatment contributed to the maximum strength in the as-spun specimens with ECPT followed by aging treatment. | Wenchen Xu Chuan Yang Haiping Yu Xueze Jin Guojing Yang Debin Shan Bin Guo | 2021 | Journal of Magnesium and Alloys2021，9，5： | 1 |
| 5 | Study on precision forging technology for a complex-shaped light alloy forging 显示文摘 | Shan Debin Xu Wenchen Lv Yan | 2004 | Journal of Materials Processing Technology2004，151，13： | 1 |
| 6 | Experimental study on process of precision forging of an aluminium-alloy rotor显示文摘 | Shan Debin Liu Fang Xu Wenchen | 2005 | Journal of Materials Processing Technology2005，，170： | 1 |
| 7 | Effects of hot deformation parameters on flow stress and establishment of constitutive relationship system of BT20 titaniun alloy 显示文摘 | XU Wenchen SHAN Debin LU Yan | 2005 | Transactions of Nonferrous Metal Society of China2005，15，2： | 1 |
| 8 | Hot spinning of cylindrical workpieces of TA15 titanium alloy显示文摘In order to form large-diameter thin-wall cylindrical workpieces of TA15 titanium alloy,tube hot spinning experiments of the alloy were conducted on a CNC hot spinning machine.The causes of some forming defects occuring in hot spinning,such as crack,pileup,bulge and corrugation,were analyzed and the corresponding measures were put forward to avoid spinning defects,based on which a proper process scheme of hot spinning of TA15 alloy was obtained and the large-diameter and thin-walled cylindrical workpieces were formed with good quality.The results show that spinning temperature has distinct influence on forming quality of spun workpieces.The range of spinning temperature determines the spinnability of titanium alloy and the ununiformity of temperature distribution near the deformation zone leads to the formation of bulge.The reasonable heating method is that the deforming region is heated to the optimum temperature range of 600-700 ℃,the deformed region is heated continuously and a certain length of undeformed region is preheated.With the thickness-to-diameter ratio(t/D) of spun workpiece reducing to certain value(t/D<1%),surface bulge and corrugation is rather easier to come into being,which could be controlled through restraining diameter growth and employing smaller reduction rate and lower temperature in the optimum spinning temperature range. | XU Wenchen,SHAN Debin,YANG Guoping,CHEN Yu,LU Yan,and KANG Dachang School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China | 2007 | Rare Metals2007，26，S1： | 1 |
| 9 | Process design and microstructure-property evolution during shear spinning of Ti_(2)AlNb-based alloy显示文摘Rotationally symmetric workpieces of Ti_(2)AlNb-based alloys have great potential for high-temperature service condition in aviation industry,while the poor workability limits their application until now.In this study,shear spinning and heat treatment were first conducted to investigate the corresponding microstructure evolution and mechanical properties of Ti_(2)AlNb conical workpieces.The microstructure of the 1^(st) and 2^(nd) pass spun workpieces(SP1 and SP2)mainly consisted of B2+retainedα2phases.After two passes spinning,the B2 phase texture changed from<111>//ND of as-received alloy to be<001>//ND.The ultimate tensile stress(UTS)of SP1 and SP2 was increased to 1163 MPa and 932 MPa,respectively,compared with 782 MPa of as-received alloy at 650℃.Also,the yield stress anomaly(YSA)occurred in SP1 and SP2 because{110}<111>and{112}<111>cross slip systems of B2 phase were difficult to slip at or below room temperature(RT),but they became active at 650℃ and above.As an essential step for increasing the spinnability of multi-pass spinning process of the Ti_(2)AlNb alloy,the H3heat treatment scheme,i.e.960℃/2 h+850℃/12 h,was carried out between two successive passes to increase the hot workability,by which the ductility of the heat treated as-spun workpieces with the microstructure of B2+primary O+acicular secondary O+high amount spheroidizedα2phases reached 72.1%at 900℃.After being subject to the H1 heat treatment scheme,i.e.960℃-2 h,the spun workpieces with the microstructure of B2+primary O+intergranular primaryα2phases achieved an optimized comprehensive mechanical properties both at room temperature and 650℃,which should be chosen as the post-spinning heat treatment process for the service requirement. | Sibing Wang Wenchen Xu Bin Shao Guoping Yang Yingying Zong Wanting Sun Zhongze Yang Debin Shan | 2022 | Journal of Materials Science & Technology2022，，6： | 1 |
| 10 | Study on isothermal precision forging process of rare earth intensifying magnesium alloy显示文摘 | Debin Shan Wenchen Xu Xiuzhu Han Xiaolei Huang | 2011 | Materials Science & Engineering B2011，，19： | 1 |
| 11 | FreeformNet:fast and automatic generation of multiple-solution freeform imaging systems enabled by deep learning显示文摘Using freeform optical surfaces in lens design can lead to much higher system specifications and performance while significantly reducing volume and weight.However,because of the complexity of freeform surfaces,freeform optical design using traditional methods requires extensive human effort and sufficient design experience,while other design methods have limitations in design efficiency,simplicity,and versatility.Deep learning can solve these issues by summarizing design knowledge and applying it to design tasks with different system and structure parameters.We propose a deep-learning framework for designing freeform imaging systems.We generate the data set automatically using a combined sequential and random system evolution method.We combine supervised learning and unsupervised learning to train the network so that it has good generalization ability for a wide range of system and structure parameter values.The generated network FreeformNet enables fast generation(less than 0.003 s per system)of multiple-solution systems after we input the design requirements,including the system and structure parameters.We can filter and sort solutions based on a given criterion and use them as good starting points for quick final optimization(several seconds for systems with small or moderate field-of-view in general).The proposed framework presents a revolutionary approach to the lens design of freeform or generalized imaging systems,thus significantly reducing the time and effort expended on optical design. | BOYU MAO TONG YANG HUIMING XU WENCHEN CHEN DEWEN CHENG YONGTIAN WANG | 2023 | Photonics Research2023，11，8： | 0 |
| 12 | Effect of power spinning and heat treatment on microstructure evolution and mechanical properties of duplex low-cost titanium alloy显示文摘The microstructural evolution and mechanical properties of low-cost Ti-5.5Al-1Fe-3.5Cr-3.2Zr-0.2Si al-loy during power spinning and after three types of heat-treatment routines(low-temperature anneal-ing,high-temperature annealing,solution and annealing)were systematically studied.An effective heat-treatment routine to fabricate high-strength and acceptable ductile as-spun Ti-5.5Al-1Fe-3.5Cr-3.2Zr-0.2Si alloy tubes was then proposed whereby the relationship between the mechanical performances and mi-crostructures was analyzed.The{0002}_(α)and{001}_(β)textures were formed after multi-pass power spin-ning.The as-spun LC-Ti alloy exhibited a good combination of strength and elongation after heat treat-ment at 550℃for 4 h,which was ascribed to the large plastic induced low-temperature spheroidization of deformedαphase and nanoscaleαprecipitation from deformedβphase.However,the elongation de-creased evidently when Zr2Si/TiCr2 participated at the interphase boundaries after heat treatment at 550℃for 8 h.In high-temperature annealing,the elongation changed nonlinearly owing to the precipitation of Zr2Si particles at triangular grain boundaries treated at 750℃for 1 h,and the spheroidization of the deformedα_(p)phase.Under solution and annealing conditions,lenticularαs would participate from the metastableβgrains,which contributed to the greatest strength albeit poor ductility.This study provides an effective guidance for the processing and application of the low-cost titanium alloy. | Zhongze Yang Wenchen Xu Weiqing Zhang Yu Chen Debin Shan | 2023 | Journal of Materials Science & Technology2023，，5： | 0 |
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