高温变形条件下5A02铝合金的塑性成形性能  

Plastic Deformation Behavior of 5A02 Aluminum Alloy Sheet at High Temperature

作　　者：贾向东[1,2] 袁荣娟[2] 何留洋[2] 曹秒艳 王瑞[3] 赵长财[2] Jia Xiangdong;Yuan Rongjuan;He Liuyang;Cao Miaoyan;Wang Rui;Zhao Changcai(Nanjing Forestry University,Nanjing 210037,China;Yanshan University,Qinhuangdao 066004,China;Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]南京林业大学,江苏南京210037 [2]燕山大学,河北秦皇岛066004 [3]山东科技大学,山东青岛266590

出　　处：《稀有金属材料与工程》2020年第7期2189-2197,共9页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51775480);Natural Science Foundation of Jiangsu Higher Education Institutions of China(18KJB460020);High-level(Higher Education)Science Foundation of Nanjing Forestry University(GXL2018020);Youth Science and Technology Innovation Foundation of Nanjing Forestry University(CX2018027)。

摘　　要：以5A02铝合金冷轧板材为研究对象,通过单向拉伸试验和金相试验对不同变形温度、应变速率条件下5A02铝合金的塑性性能进行分析,并且借助试验数据和Zener-Hollomon参数模型,对高温条件下5A02铝合金的本构模型进行研究。结果表明:5A02铝合金在高温条件下变形时,应变速率和变形温度对延伸率的影响很大。在应变速率为0.01、0.001、0.0005和0.0001s-1条件下,当变形温度大于250℃时,5A02铝合金的延伸率大于100%。当变形温度为150~250℃时,5A02铝合金的真实应力-应变曲线属于动态回复型,而当变形温度大于250℃时,流变应力曲线存在明显的软化现象。Taking 5A02 aluminum alloy cold-rolled sheet as the research object,the plastic deformation behavior of 5A02 aluminum alloy at different temperatures and strain rates was analyzed through uniaxial tensile test and metallographic test.Through combining experimental data and Zener-Hollomon parameter model,the constitutive model of 5A02 aluminum alloy under high temperature conditions was studied.The results show that the strain rate and deformation temperature have a great influence on the elongation when the 5A02 aluminum alloy is deformed under high temperature conditions.At strain rates of 0.01,0.001,0.0005 and 0.0001 s-1,the elongation of 5A02 aluminum alloy is greater than 100%when the deformation temperature is above 250℃.The true stress-strain curve of 5A02 aluminum alloy is characterized by dynamic recovery when the deformation temperature is 150~250℃,and the flow stress curve has obvious softening phenomenon when the deformation temperature is above 250℃.

关 键 词：5A02铝合金 高温拉伸 塑性性能 流变应力 本构模型 

分 类 号：TG146.21[一般工业技术—材料科学与工程]