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,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.]
SPS制备NiTi表面多孔梯度合金的组织演变与力学性能研究
投稿时间:2016-11-01  修订日期:2016-11-16
中文关键词:  镍钛梯度合金  烧结温度  微观组织演变  表面孔隙特征  力学性能
基金项目: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)
中文摘要:
      利用放电等离子烧结技术制备了基体为NiTi、表面为多孔NiTi的生物医用梯度合金,研究了烧结温度对梯度合金的微观结构、显微组织演变、表面孔隙特征及力学性能的影响。结果表明:随着烧结温度升高,合金由Ti、Ni、Ti2Ni、NiTi3混合相逐渐演变为以NiTi相为主及少量残留Ti2Ni、NiTi3相组成的组织,基体与多孔层界面处裂纹及缺陷逐渐减少并形成稳定的冶金结合,内外层晶粒不断细化,但过高的烧结温度会导致多孔层孔隙融合连通,使得梯度结构遭到破坏,同时表面多孔层孔隙率与平均孔径呈缓慢减小趋势;合金压缩弹性模量随烧结温度升高变化不明显,而抗压强度呈显著增大趋势。与块体NiTi合金及多孔NiTi合金相比,所制备梯度合金不仅具有良好的界面结合和表层孔隙特征、较高的抗压强度及较低的弹性模量,还具有优异的超弹性性能。
Microstructure Evolution and Mechanical Properties of Porous Surface NiTi Gradient Alloy Prepared by Spark Plasma Sintering
英文关键词:NiTi gradient alloy  sintering temperatures  microstructure evolution  surface pore characteristics  mechanical properties
英文摘要:
      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.
作者单位E-mail
栗智 昆明理工大学 材料科学与工程学院 936586723@qq.com 
张磊 昆明理工大学 材料科学与工程学院  
孟增东 云南省第一人民医院 骨外科  
何正员 昆明理工大学 材料科学与工程学院  
张玉勤 昆明理工大学 材料科学与工程学院 zyqkust@163.com 
蒋业华 昆明理工大学 材料科学与工程学院  
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