聂祯一,艾云龙,何文,陈卫华,王家宣

• 1:南昌航空大学材料科学与工程学院
• 2:江西省金属材料微结构调控重点实验室(南昌航空大学)
• 3:江西雄鹰铝业技术中心

摘要(Abstract)：

采用Gleebe-3500型热模拟试验机对7075铝合金进行等温恒应变速率热压缩实验,研究了该合金在变形温度为250~450℃、应变速率为0.001~1 s~(-1)条件下的热变形行为,并据此建立了热加工图。结果表明:流变真应力随应变速率的升高而增大,随变形温度的升高而减小;经250℃、16 h欠时效处理的样品,其峰值应力要显著大于未经时效的样品;真应变为0.3和0.7的热加工图在250~350℃的温度区间、0.01~1 s~(-1)的应变速率区间均出现流变失稳;16 h欠时效态7075铝合金的最佳热变形参数为:变形温度400~450℃、应变速率0.01~0.001 s~(-1)。

关键词(KeyWords)： 7075铝合金;热变形;真应力;真应变;热加工图

Abstract:

Keywords:

基金项目(Foundation): 江西省自然科学基金(20122BAB206015);; 江西省金属材料微结构调控重点实验室开放基金(JW201523005)

作者(Author): 聂祯一,艾云龙,何文,陈卫华,王家宣

DOI: 10.13289/j.issn.1009-6264.2017-0012

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