【作者】 付建龙； 陈枫； 佟运祥； 田兵； 李莉；

【Author】 FU Jian-long,CHEN Feng,TONG Yun-xiang,TIAN Bing,LI Li (Center for Biomedical Materials & Engineering,Harbin Engineering University,Harbin 150001,China)

【机构】 哈尔滨工程大学生物医学材料与工程研究中心；

【摘要】 以Ni₅₀Mn₅₀（%）合金为基础,添加第三元素Ti取代Mn形成三元合金,使用金相显微镜、XRD、DSC、SEM、压缩等测试方法,系统地研究了NiMnTi合金的组织结构、相变特性和力学性能。研究结果表明,Ni₅₀Mn_50-xTi_x（x=4,6,8%）合金表现出典型的热弹性马氏体相变,且随Ti含量的增加,M_s点温度呈线性下降。金相显微镜和XRD测试表明,在室温下Ni₅₀Mn_50-xTi_x合金的的组织为四方结构的马氏体,压缩试验和SEM断口形貌观察表明合金的断裂特征都为脆性断裂,Ti含量增加对塑性的提高效果不明显。更多还原

【Abstract】 In this thesis,Ti was added to Ni₅₀Mn₅₀（at.%）alloy by replacing Mn.Microstructures,martensitic transformation behaviors,mechanical properties were systematically studied by optical micrograph,XRD,DSC, SEM and compressive tests.The results show that Ni₅₀Mn_50-xTi_x（x = 4,6,8 at.%）alloys exhibit thermal elastic martensitic transformation,and martensitic transformation temperatures decrease linearly with increasing Ti content.The optical micrograph and XRD indicate that martensite structures in Ni₅₀Mn_50-xTi_x.have been found to be an ordered structure with an tetragonal unit cell at room temperature.Compressive tests and SEM results show that the brittle fracture characteristic is found in such alloys.Ductility of the NiMn alloy is not obviously improved by the addition of Ti.更多还原