铸态退火<strong>2024</strong>合金在不同温度下的变形行为

doi:10.11901/1005.3093.2021.357

材料研究学报

2022, Vol. 36

Issue (10): 730-738 DOI: 10.11901/1005.3093.2021.357

研究论文

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铸态退火2024合金在不同温度下的变形行为

杨兵¹, 刘春忠¹(

), 高恩志¹, 孙巍², 刘停¹, 张洪宁¹, 朱明伟¹, 卢天倪¹

^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

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

YANG Bing¹, LIU Chunzhong¹(

), GAO Enzhi¹, SUN Wei², LIU Ting¹, ZHANG Hongning¹, ZHU Mingwei¹, LU Tianni¹

^1.School of Material Science and Engineering, Shenyang Aerospace University, Shenyang 110136, China
^2.Liaoning Zhongwang Group Co. Ltd., Liaoyang 111003, China

引用本文:

杨兵, 刘春忠, 高恩志, 孙巍, 刘停, 张洪宁, 朱明伟, 卢天倪. 铸态退火2024合金在不同温度下的变形行为[J]. 材料研究学报, 2022, 36(10): 730-738.
Bing YANG, Chunzhong LIU, Enzhi GAO, Wei SUN, Ting LIU, Hongning ZHANG, Mingwei ZHU, Tianni LU. Deformation Behavior of Cast and Annealed 2024 Al-alloy at Different Temperatures[J]. Chinese Journal of Materials Research, 2022, 36(10): 730-738.

全文: PDF(5854 KB) HTML

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。

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

Abstract：

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 2024 Al-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.

Key words： metallic materials 2024 aluminum alloy stress-strain curve constitutive equation DMM processing map isothermal extrusion

收稿日期: 2021-06-16

ZTFLH:

TG146

基金资助: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)

作者简介: 杨兵,男,1987年生,硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2021.357 或 https://www.cjmr.org/CN/Y2022/V36/I10/730

图1 等温挤压结构件的示意图

图2 拉伸试样的示意图

图3 2024铝合金在不同应变速率下的应力-应变曲线

图4 不同变形条件下2024铝合金峰值应力、应变速率和变形温度间的关系

表1 不同温度和应变率下的峰值应力

图5 2024铝合金的流变应力与参数Z的关系

图6 2024铝合金的三维功率耗散图

图7 2024铝合金的三维流变失稳图

图8 2024铝合金的DMM加工图

图9 2024铝合金的铸态退火组织

图10 2024铝合金的挤压态组织

图11 2024铝合金铸锭的退火态、挤压态和挤压退火态TEM照片

图12 不同状态2024铝合金的室温应力-应变曲线

图13 2024铝合金不同方向的室温应力-应变曲线

表2 2024铝合金不同状态和方向试样的拉伸性能

图14 2024合金挤压态的EBSD取向图

图15 2024合金挤压态的晶界取向差角分布图

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