固溶态和时效态7075铝合金的微纳米压痕力学行为  

Micro-nano indentation mechanical behavior of 7075 aluminum alloy in solution and aging states

作　　者：郑可 李传维[1] 顾剑锋[1,2] ZHENG Ke;LI Chuan-wei;GU Jian-feng(Shanghai Key Laboratory of Materials Laser Processing and Modification,Shanghai Jiao Tong University,Shanghai 200240,China;Institute of Materials Modification and Modelling,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学,上海市激光制造与材料改性重点实验室,上海200240 [2]上海交通大学材料科学与工程学院,材料改性与数值模拟研究所,上海200240

出　　处：《材料热处理学报》2023年第1期39-48,共10页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金面上项目(52171042)。

摘　　要：采用微纳米压痕实验研究了固溶态和时效态7075铝合金的力学性能和压痕蠕变行为,获得了其力学本构方程、应力-应变曲线和蠕变应力指数。结果表明:两种状态铝合金的硬度和弹性模量均随着载荷的增大而减小,并在压痕深度小于1μm时表现出明显的尺寸效应。固溶态和时效态铝合金的屈服强度分别为446 MPa和497 MPa,抗拉强度分别为594 MPa和691 MPa。两种状态合金的最大蠕变深度和蠕变应力指数变化趋势相似,均随载荷和加载速率的增大而增大。The mechanical properties and indentation creep behavior of 7075 aluminum alloy in solution and aging states were studied by micro-nano indentation experiments,and its mechanical constitutive equation,stress-strain curves and creep stress index were obtained.The results show that the hardness and elastic modulus of the aluminum alloy in both states decrease with the increase of load,and shows an obvious size effect when the indentation depth is less than 1μm.The yield strength of the aluminum alloy in solution and aging states is 446 MPa and 497 MPa,respectively,and the tensile strength is 594 MPa and 691 MPa,respectively.The maximum creep depth and creep stress index of the alloy in both states have similar trends,and both increase with the increase of load and loading rate.

关 键 词：7075铝合金 微纳米压痕试验 尺寸效应 本构关系 压痕蠕变 

分 类 号：TG146.2[一般工业技术—材料科学与工程]