挤压温度对Al-Zn-Mg合金力学性能的影响*

doi:10.11901/1005.3093.2015.022

材料研究学报

2016, Vol. 30

Issue (2): 87-94 DOI: 10.11901/1005.3093.2015.022

本期目录 | 过刊浏览

挤压温度对Al-Zn-Mg合金力学性能的影响*

邓运来^1,²(

), 王亚风^1,², 林化强^1,³, 叶凌英^1,², 刘胜胆^1,², 谭谦^1,², 张新明^1,²

1. 中南大学材料科学与工程学院长沙 410083
2. 有色金属材料科学与工程教育部重点实验室长沙 410083
3. 青岛四方机车车辆股份有限公司国家高速动车组总成工程技术研究中心青岛 266000

Effect of Extrusion Temperature on Strength and Fracture Toughness of an Al-Zn-Mg Alloy

DENG Yunlai^1,^2,^**(

), WANG Yafeng^1,², LIN Huaqiang^1,³, YE Lingying^1,², LIU Shengdan^1,², TAN Qian^1,², ZHANG Xinming^1,²

1. School of Materials Science and Engineering, Central South University, Changsha 410083, China
2. The Key Laboratory of Nonferrous Materials Science and Engineering of Ministry of Education, Central South University, Changsha 410083, China
3. National Engineering Research Center for High-speed EMU, CSR Qingdao Sifang Co., Ltd., Qingdao 266111, China

引用本文:

邓运来, 王亚风, 林化强, 叶凌英, 刘胜胆, 谭谦, 张新明. 挤压温度对Al-Zn-Mg合金力学性能的影响*[J]. 材料研究学报, 2016, 30(2): 87-94.
Yunlai DENG, Yafeng WANG, Huaqiang LIN, Lingying YE, Shengdan LIU, Qian TAN, Xinming ZHANG. Effect of Extrusion Temperature on Strength and Fracture Toughness of an Al-Zn-Mg Alloy[J]. Chinese Journal of Materials Research, 2016, 30(2): 87-94.

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摘要:

用光学显微镜,扫描电镜,透射电镜,常温拉伸以及Kahn撕裂实验等手段, 研究了挤压温度对Al-Zn-Mg合金型材表层和中心层强度和断裂韧性的影响.结果表明: 挤压型材表层以细小等轴的再结晶晶粒为主, 中心层为发生部分再结晶的纤维组织, 沿挤压方向中心层强度高于表层, L-T取向的断裂韧性表层高于中心层.挤压温度由440-450℃时升高至480-490℃时动态再结晶程度升高, 强度升高, 而断裂韧性降低; 时效后晶内析出相更细小, 晶界析出相粗化,不连续, 中心层的再结晶分数由14.8%升高至52.3%, 屈服强度也从280 MPa升至314 MPa, 而UIE由229 Nmm^-1降低至204 Nmm^-1.

关键词 ：金属材料, 挤压温度, Al-Zn-Mg合金, 强度, 断裂韧性

Abstract：

The effect of extrusion temperature on the tensile properties and fracture toughness of an Al-Zn-Mg alloy was investigated by optical microscopy, scanning electron microscopy, transmission electron microscopy, tensile tests and Kahn tear tests. The results showed that after extrusion the alloy possesses a surface layer composed of fine equiaxed grains with higher toughness in the L-T orientation than that of its center layer, which composed of fiber-like texture and recrystallized grains, while the tensile strength of the center layer is higher than that of the surface layer. When the extrusion temperature increases from 440-450℃ to 480-490℃, the dynamic recrystallization becomes more serious, and the tensile properties and fracture toughness become lower and higher respectively. After aging the precipitates in grains become smaller and the precipitates at grain boundaries are coarsening and discontinuous. Taking the central layer for example, the volume fraction of recrystallized grains increases from 14.8% to 52.3%, correspondingly σ_0.2 increases from 280 MPa to 314 MPa, while UIE decrease from 229 Nmm^-1 to 204 Nmm^-1.

Key words： metallic materials extrusion temperature Al-Zn-Mg alloy tensile properties fracture toughness

收稿日期: 2015-01-13

ZTFLH:

TG146

基金资助:* 国家重点基础研究发展计划2012CB619500资助项目

作者简介: 通讯作者：邓运来, 教授

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https://www.cjmr.org/CN/10.11901/1005.3093.2015.022 或 https://www.cjmr.org/CN/Y2016/V30/I2/87

表1 Al-Zn-Mg合金挤压工艺参数

表2 Al-Zn-Mg合金力学性能

图1 挤压温度不同的Al-Zn-Mg合金表层和中心层的金相组织

图2 挤压温度不同的Al-Zn-Mg合金表层和中心层的EBSD

图3 挤压温度不同的Al-Zn-Mg合金表层和中心层晶界角度统计图

图4 在不同温度挤压后Al-Zn-Mg合金的SEM照片

表4 Al-Zn-Mg合金第二相能谱分析结果

表5 不同挤压温度下Al-Zn-Mg合金电导率

图5 在不同温度挤压的Al-Zn-Mg合金断裂韧性样品断口的SEM像

图6 在440-450℃挤压的Al-Zn-Mg合金表层和中心层的TEM像及电子衍射花样

图7 在480-490℃挤压的Al-Zn-Mg合金表层和中心层的TEM像及电子衍射花样

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