铸态退火2024合金在不同温度下的变形行为  

Deformation Behavior of Cast and Annealed 2024 Al-alloy at Different Temperatures

作　　者：杨兵 刘春忠 高恩志 孙巍 刘停 张洪宁 朱明伟 卢天倪 YANG Bing;LIU Chunzhong;GAO Enzhi;SUNWei;LIU Ting;ZHANG Hongning;ZHU Mingwei;LU Tianni(School of Material Science and Engineering,Shenyang Aerospace University,Shenyang 110136,China;Liaoning Zhongwang Group Co.Ltd.,Liaoyang 111003,China)

机构地区：[1]沈阳航空航天大学材料科学与工程学院,沈阳110136 [2]辽宁忠旺集团有限公司,辽阳111003

出　　处：《材料研究学报》2022年第10期730-738,共9页Chinese Journal of Materials Research

基　　金：国家自然科学基金(51405310);辽宁省科技厅重大专项(2019JH1/10100012);辽宁省教育厅一般资助项目(JYT19064)。

摘　　要：使用MMS-200热力模拟实验机研究了工程用铸态退火2024合金(φ247 mm)在不同温度下的变形行为,建立了热变形的本构方程和DMM(Dynamic material model)加工图。分析了铸锭退火态、等温挤压及等温挤压退火实验件的微观组织和力学性能,结果表明:根据DMM加工图确定的热变形温度395~450℃和应变速率0.01~0.1 s^(-1)工艺,可制备出组织明显细化、力学性能优异的大挤压比2024铝合金等温挤压件。Deformation behavior at different temperatures of the cast and annealed 2024 Al-alloy was investigated by means of MMS thermal simulation test machine.The constitutive equation and DMM(Dynamic material model)processing map of the alloy were established.The theoretical support for 2024Al-alloy extrusion part with an extrusion ratio of 26.9 was provided by the results obtained from DMM map.The microstructures and mechanical properties of the alloys in different situations,namely,the cast plus post annealing,isothermally extruded and isothermally extruded plus post annealing were characterized by OM(Optical microscope),TEM(Transmission electron microscope)and tension tester.The results show that the test articles of 2024 Al-alloy experienced isothermal extrusion with large extrusion ratio can be obtained by strain rate within the range of 0.01~0.1 s^(-1)at temperatures within 395~450℃,according to the proposed DMM processing map,consequently,the resulted test articles present refined microstructure with excellent mechanical properties.

关 键 词：金属材料 2024铝合金 应力-应变曲线 本构方程 DMM加工图 等温挤压 

分 类 号：TG146[一般工业技术—材料科学与工程]