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栗智,张磊,孟增东,何正员,张玉勤,蒋业华.SPS制备NiTi表面多孔梯度合金的组织演变与力学性能研究[J].稀有金属材料与工程(英文),2018,47(1):371~377.[Li Zhi,Zhang Lei,Meng zengdong,He zhengyuan,Zhang Yuqin,Jiang Yehua.Microstructure Evolution and Mechanical Properties of Porous Surface NiTi Gradient Alloy Prepared by Spark Plasma Sintering[J].Rare Metal Materials and Engineering,2018,47(1):371~377.]
Microstructure Evolution and Mechanical Properties of Porous Surface NiTi Gradient Alloy Prepared by Spark Plasma Sintering
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Received:November 01, 2016  Revised:November 16, 2016
DOI:
Key words: NiTi gradient alloy  sintering temperatures  microstructure evolution  surface pore characteristics  mechanical properties
Foundation item:国家自然科学基金资助项目(31660262);云南省教育厅科学研究基金资助项目(2016ZZX049)
Author NameAffiliationE-mail
Li Zhi School of Materials Science and Engineering,Kunming University of Science and Technology 936586723@qq.com 
Zhang Lei School of Materials Science and Engineering,Kunming University of Science and Technology  
Meng zengdong 云南省第一人民医院 骨外科  
He zhengyuan School of Materials Science and Engineering,Kunming University of Science and Technology  
Zhang Yuqin School of Materials Science and Engineering,Kunming University of Science and Technology zyqkust@163.com 
Jiang Yehua School of Materials Science and Engineering,Kunming University of Science and Technology  
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Abstract:
      The effects of different sintering temperature on the microstructure, microstructural evolution, surface porosity and mechanical properties of porous surface NiTi biomedical gradient alloy were investigated. The results show that the gradient alloy are consisted of complex Ti, Ni, Ti2Ni, Ni3Ti mixed phase and gradually transformed into NiTi phase also little Ti2Ni、Ni3Ti phase with increasing of the sintering temperatures. The cracks and defects at the interface between the matrix and the porous layer are gradually reduced and a stable metallurgical bonding is formed. The inner and outer grains are refined continuously, but the higher sintering temperature leads to the porosity fusion of the porous layer, resulting in the damage of the gradient structure. The porosity and the average pore size of surface layer decreases slowly. The compressive elastic modulus of the alloy changes with the sintering temperature is not obvious, while the compressive strength shows a significant increase trend. Compared with bulk NiTi alloy and porous NiTi alloy, the prepared gradient alloy not only has good interface bonding and surface pore characteristics, high compressive strength and low elastic modulus, but also has excellent super-elastic properties.