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| 1 | Microstructure and mechanical property evolution of friction stir welded(B4C+Al2O3)/Al composites designed for neutron absorbing materials显示文摘(B4C+Al2O3)/Al composite designed for the dry storage of spent nuclear fuels was fabricated and then subjected to friction stir welding, at a welding speed of 100 mm/min and rotation rates of 400–800 r/min. Sound joints were obtained under all welding parameters;however, significant softening occurred in the nugget zone(NZ) for all the joints. Therefore, all the joints exhibited significantly decreased strength at both room temperature and high temperature compared with the base metal, with the joints fracturing in the NZs. Rotation rate exhibited no obvious effect on the tensile strength of the joints, but led to increased elongation as the result of the broadened NZs. The detailed microstructural examinations indicated that the welding thermomechanical effect broke up the near 3D amorphous Al2O3 netlike structure distributed at the Al grain boundaries, caused the coarsening of Al grains, and the agglomeration and crystallization of amorphous Al2O3, thereby resulting in the softening of the NZs and the reduction in the joint strength. Consequently, inhibiting the breakup and crystallization of 3D amorphous Al2O3 netlike structure is the key factor to improve the joint strength of the(B4C+Al2O3)/Al composite. | ZAN YuNing WANG BeiBei ZHOU YangTao JIA CunLei LIU ZhenYu WANG QuanZhao XIAO BoLv MA ZongYi | 2020 | Science China(Technological Sciences)2020，63，7： | 3 |
| 2 | Wear behavior of the raw and pre-smashed carbon nanotubes reinforced 6061Al composites fabricated by powder metallurgy显示文摘The raw and pre-smashed(PS)carbon nanotube(CNT)reinforced 6061Al composites(CNT/6061Al)with different CNT contents were respectively fabricated by powder metallurgy technology.It was found that reducing the CNT cluster size by presmashing processing could sharply reduce the friction coefficient,and significantly improve the density,hardness,and wear resistance of the CNT/6061Al composites.For the raw-CNT/6061Al composites,the wear rate increased approximately linear trend while the CNT content was over 1 wt.%.The plastic deformation,deep grooves,and serious delamination were presented on the wear surface.The wear process was gradually transformed from Al-copper base counterpart wear into Al-Al wear for the higher adhesion-binding energy between aluminum and copper base counterpart.While for the PS-CNT/6061Al composites,the wear rate gradually decreased as the CNT content increased from 0 to 2 wt.%.This was mainly because the generation of the thinner mechanically mixed layer(MML)and the PS-CNT prevented the direct contact between specimen and copper base counterpart,which effectively inhibited the adhesive wear.But excessive PS-CNTaddition(~3 wt.%)would weaken the bonding between CNT and 6061Al,and thus the wear resistance of the composite was reduced apparently. | LI XiaoNan LIU ZhenYu ZAN YuNing XIAO BoLü NI DingRui WANG QuanZhao WANG Dong MA ZongYi | 2022 | Science China(Technological Sciences)2022，65，5： | 1 |
| 3 | Thermally stable microstructures and mechanical properties of B4C-Al composite with in-situ formed Mg(Al)B2显示文摘B4C particulate-reinforced 6061A1 composite was fabricated by powder metallurgy method. The as-rolled composite possesses high tensile strength which is comparable to that of the peak-aged 6061A1 alloy. More importantly, the microstructures and mechanical properties are thermally stable during long-term holding at elevated temperature (400℃). The microstructual contributions to the strength of the composite were discussed. Transmission electron microscopy (TEM) analysis indicates that the in-situ formed reinforcement Mg(Al)B2, as products of the interfacial reactions between B4C and the aluminum matrix, show not only good resistance to thermal coarsening but also strong pinning effect to the grain boundaries in the alloy matrix. | Yangtao Zhou Yuning Zan Shijian Zheng Xiaohong Shao Qianqian Jin Bo Zhang Quanzhao Wang Bolv Xiao Xiuliang Ma Zongyi Ma | 2019 | Journal of Materials Science & Technology2019，35，9： | 1 |
| 4 | Effects of hot-pressing parameters on microstructure and mechanical properties of composites synthesized by Al-TiO_(2) in-situ reaction显示文摘As a classic in-situ reaction, the Al-TiO_(2) reaction is expected to prepare aluminum matrix composites with high thermal stability.In this study, it was found that the preparation method of ensuring sufficient reaction using higher temperatures in previous studies was not conducive to acquiring optimized high-temperature strength. With the increase of hot-pressing temperature and the extension of holding time, the in-situ reaction became more thorough, but the strength of the composites first increased and then decreased. Coarsening of the microstructure at high temperatures would lead to degradation of strength and controlling the in-situ reaction process by the hot-pressing parameters could optimize the mechanical properties of the composites. Strengthening mechanisms at room and high temperatures were studied, and it was found that the load-transfer and Orowan strengthening mechanisms are the main strengthening effects at room temperature, while the pinning effect of fine particles became more crucial at elevated temperatures. As a result, the coarsening of the reinforcing phases was more detrimental to the hightemperature strength. Therefore, an insufficient in-situ reaction led to more excellent mechanical properties, and the composite hot-pressed at 605℃ and held for 2 h exhibited the highest strength, which was 367 MPa at room temperature and 170 MPa at 350℃. | LIU Yin CHEN WanQi GU LiMing LI XiaoNan ZAN YuNing WANG QuanZhao WANG Dong XIAO BoLv MA ZongYi | 2023 | Science China(Technological Sciences)2023，66，9： | 0 |
| 5 | Mechanical properties of(B_(4)C+Al_(2)O_(3))/Al neutron absorbing materials with various microstructures constructed by hot forging,rolling and extrusion显示文摘Neutron absorbing materials(NAMs)are necessary in the nuclear industry for the storage and transportation of spent fuel.Among all the NAMs,B_(4)C/Al composites are widely used because of the specific neutron absorption capacity[1–4].Compared with traditional low-strength functional NAMs such as B_(4)C/1100Al and B_(4)C/6061Al,NAMs with enough high-temperature(350℃)strength are competent for further structural usage and exhibit huge advantages in the dry storage of spent fuel because of heat transfer ability and weight reduction[5]. | ZAN YuNing LI XinNan ZHOU Cong LIU ZhenYu WANG QuanZhao XIAO BoLü MA ZongYi | 2022 | Science China(Technological Sciences)2022，65，5： | 0 |
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