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Fabrication of lightweight 3D interpenetrated NiTi@Mg composite with superior bending properties
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作者 Yu-jing LIU Xiao-chun LIU +4 位作者 Kun-mao LI Xiang WU Sheng-feng ZHOU Wei LI Wen-cai ZHANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS 2024年第11期3569-3584,共16页
A NiTi@Mg interpenetrating phase composite with high strength and lightweight was prepared by additive manufacturing(AM)and infiltration technology,and the interface bonding,three-point bending properties and cyclic c... A NiTi@Mg interpenetrating phase composite with high strength and lightweight was prepared by additive manufacturing(AM)and infiltration technology,and the interface bonding,three-point bending properties and cyclic compressive properties of NiTi@Mg composites were investigated.The results show that the metallurgically bonded interface is formed at the NiTi/Mg interfaces.The bending strength and compressive strength of the NiTi@Mg composite are 2.5 and 1.7 times higher than those of the NiTi scaffold,respectively.During the bending deformation process,a large number of dislocations are observed to accumulate in the soft Mg area at the interface.Furthermore,the finite element model showed that the stress accumulation area,where the bending crack is initiated,is located at the interface of NiTi and Mg.The strengthening mechanism of NiTi@Mg composites is attributed to the twinning strengthening of Mg and heterogeneous structure strengthening. 展开更多
关键词 metal composites niti@mg bending properties finite element simulation strengthening mechanism
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Preparation and characterization of porous NiTi alloys synthesized by microwave sintering using Mg space holder 被引量:4
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作者 Tao LAI Ji-lin XU +5 位作者 Qi-fei XIAO Yun-xiang TONG Jun HUANG Jian-ping ZHANG Jun-ming LUO Yong LIU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2021年第2期485-498,共14页
To obtain the lightweight,high strength,and high damping capacity porous NiTi alloys,the microwave sintering coupled with the Mg space holder technique was employed to prepare the porous NiTi alloys.The microstructure... To obtain the lightweight,high strength,and high damping capacity porous NiTi alloys,the microwave sintering coupled with the Mg space holder technique was employed to prepare the porous NiTi alloys.The microstructure,mechanical properties,phase transformation behavior,superelasticity,and damping capacity of the porous NiTi alloys were investigated.The results show that the porous NiTi alloys are mainly composed of the B2 NiTi phase with a few B19'NiTi phase as the sintering temperature is lower than or equal to 900℃.With increasing the sintering temperature,the porosities of the porous NiTi alloys gradually decrease and the compressive strength increases first,reaching the maximum value at 900℃,and then decreases.With increasing the Mg content from 1 wt.%to 7 wt.%,the porosities of the porous NiTi alloys increase from 37.8%to 47.1%,while the compressive strength decreases from 2058 to 1146 MPa.Compared with the NH4HCO3 space holder,the phase transformation behavior of the porous NiTi alloys prepared with Mg space holder changes,and all of the compressive strength,superelasticity,shape memory effect and damping capacity are greatly improved. 展开更多
关键词 porous NiTi alloy microwave sintering Mg space holder SUPERELASTICITY damping capacity
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