舒小勇,胡林丽,鲁世强,李贵发,王克鲁

• 1:江西省金属材料微结构调控重点实验室(南昌航空大学)
• 2:南京航空航天大学材料科学与技术学院
• 3:江西机电职业技术学院材料工程系

摘要(Abstract)：

采用Gleeble-3500热模拟试验机对锻态Ni_(55)Ti_(45)合金进行等温恒应变速率压缩实验,研究了该合金在变形温度为650~850℃、应变速率为0.01~1 s~(-1)范围内的高温变形特性,并分析其变形机制。结果表明,应力-应变曲线呈"应变软化"型,热变形激活能为317.304 k J/mol,根据双曲正弦函数建立了峰值流变应力本构方程。微观组织观察表明,在650℃、1 s~(-1)和700℃、1 s~(-1)时发生了局部塑性流动的失稳变形,主要由变形热效应导致。高温、低应变速率利于动态再结晶的发生,但动态再结晶晶粒尺寸更大。动态再结晶形核机制以晶界弓出机制为主,同时伴随有少量的PSN机制。

关键词(KeyWords)： Ni55Ti45形状记忆合金;高温变形特性;变形激活能;变形机制

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51164030);; 江西省教育厅科技项目(GJJ150703);; 江西省金属材料微结构调控重点实验室(南昌航空大学)开放基金(JW201523001)

作者(Author): 舒小勇,胡林丽,鲁世强,李贵发,王克鲁

DOI: 10.13289/j.issn.1009-6264.2017-0027

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