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徐吉林,陶寿晨,金晓飞,罗军明,刘勇.颗粒尺寸对微波烧结多孔NiTi合金的显微结构及力学性能的影响[J].稀有金属材料与工程(英文),2020,49(2):454~460.[Xu Jilin,Tao Shouchen,Jin Xiaofei,Luo Junming and Liu Yong.Effect of particle size on the microstructure and mechanical properties of the porous NiTi alloys prepared by microwave sintering[J].Rare Metal Materials and Engineering,2020,49(2):454~460.]
Effect of particle size on the microstructure and mechanical properties of the porous NiTi alloys prepared by microwave sintering
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Received:September 26, 2018  Revised:November 02, 2018
DOI:
Key words: Porous NiTi alloy  Microwave sintering  Particle size  Mechanical property  Microstructure
Foundation item:国家基金,航空基金,江西省轻质高强结构材料重点实验室开放基金
Author NameAffiliation
Xu Jilin,Tao Shouchen,Jin Xiaofei,Luo Junming and Liu Yong  
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Abstract:
      The porous NiTi alloys were prepared by microwave sintering with different Ni/Ti powder particle sizes, and the effect of particle size on the microstructure and mechanical properties of the porous NiTi alloys was systematically investigated. The results show that the undesired Ti2Ni and Ni3Ti phases in the porous NiTi alloys decrease and the Ni phase disappears with decreasing the particle sizes. At the same time, the pore shapes of the porous NiTi alloys change from the irregular shape with sharp angles to the suborbicular shape. Moreover, both of the porosities and pore sizes of the porous NiTi alloys increase with increasing the particle sizes, while all of the Rockwell hardness, compressive strength and bending strength decrease. Therefore, the decrease of particle sizes can be beneficial to obtain the microwave sintered porous NiTi alloys with desired microstructure (pure phase composition and uniform pore structure) and high mechanical properties.