Cu含量对Al-Cu-Mn合金力学性能各向异性的影响

doi:10.11901/1005.3093.2017.766

材料研究学报

2018, Vol. 32

Issue (11): 853-860 DOI: 10.11901/1005.3093.2017.766

本期目录 | 过刊浏览

Cu含量对Al-Cu-Mn合金力学性能各向异性的影响

余芳^1,³, 徐道芬^2,^3,⁴, 陈送义^2,³, 陈康华^1,^2,³(

), 王习锋^1,³, 刘德博⁵, 马云龙⁵, 黄诚⁵, 鄢东洋⁵

1 中南大学轻质高强结构材料重点实验室长沙 410083
2 中南大学轻合金研究院长沙 410083
3 中南大学有色金属先进结构材料与制造协同创新中心长沙 410083
4 桂林航天工业学院桂林 541004
5 北京宇航系统工程研究所北京 100076

Effect of Cu Content on Anisotropy of Mechanical Property of Al-Cu-Mn Alloy

Fang YU^1,³, Daofen XU^2,^3,⁴, Songyi CHEN^2,³, Kanghua CHEN^1,^2,³(

), Xifeng WANG^1,³, Debo LIU⁵, Yunlong MA⁵, Cheng HUANG⁵, Dongyang YAN⁵

1 Science and Technology on High Strength Structural Materials Laboratory, Central South University, Changsha 410083, China
2 Light Alloy Research Institute, Central South University, Changsha 410083, China
3 Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Center, Central South University, Changsha 410083, China
4 Guilin University of Aerospace Technology, Guilin 541104, China
5 Beijing Institute of Astronautical Systems Engineering, Beijing 100076, China

引用本文:

余芳, 徐道芬, 陈送义, 陈康华, 王习锋, 刘德博, 马云龙, 黄诚, 鄢东洋. Cu含量对Al-Cu-Mn合金力学性能各向异性的影响[J]. 材料研究学报, 2018, 32(11): 853-860.
Fang YU, Daofen XU, Songyi CHEN, Kanghua CHEN, Xifeng WANG, Debo LIU, Yunlong MA, Cheng HUANG, Dongyang YAN. Effect of Cu Content on Anisotropy of Mechanical Property of Al-Cu-Mn Alloy[J]. Chinese Journal of Materials Research, 2018, 32(11): 853-860.

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摘要:

采用室温力学拉伸、光学显微镜(OM)、扫描电镜(SEM)等手段,研究了Cu含量对Al-Cu-Mn铝合金力学性能各向异性的影响。结果表明：随着Cu含量(质量分数)由6.51%降低到5.41%Al-Cu-Mn铝合金中微米级Al₂Cu相的数量显著减少,聚集排布的趋势减弱,使材料的延伸率提高、各向异性降低。其主要机理是,Cu含量较高时微米级Al₂Cu相应力集中,导致Al₂Cu相优先断裂且裂纹相互连通;Cu含量较低时,Al₂Cu相断裂后裂纹未扩展而晶界发生断裂。微米级Al₂Cu相沿各取向的分布差异,是力学性能各向异性的主要原因。

关键词 ：金属材料, Al-Cu-Mn合金, Cu含量, 各向异性

Abstract：

The effect of Cu-content on microstructure and fracture behavior of Al-Cu-Mn alloy was investigated by tensile test, optical microscope (OM) and scanning electron microscope (SEM). The results show that with the decrease of Cu-content from 6.51% to 5.41% (in mass fraction) the quantity and size of the coarse Al₂Cu phase in the alloy is reduced, the elongation of the alloy increases and thus the anisotropy of the alloy is decreased. The main mechanism is that for the alloy with relatively high Cu-content, the formed micron Al₂Cu phase causes stress concentration, which induces preferentially breakage of Al₂Cu phase and then the formed cracks are interconnected. However, for the alloy with lower Cu-content, the cracks do not expand and connect with each other after the breakage of Al₂Cu phase, while fracture may expand along grain boundaries. The difference in orientation distribution of micron phases of Al₂Cu in the matrix of alloy may be the main reason for the anisotropy of mechanical properties.

Key words： metallic materials Al-Cu-Mn alloy Cu contents anisotropy

收稿日期: 2017-12-27

ZTFLH:

TG146

基金资助:国家自然科学基金(U1637601),江苏省科技成果转化计划(BA2015075),国家重点研发计划(2016YFB0300801),国家自然科学基金重大科研仪器设备研制专项(51327902)

作者简介:

作者简介余芳,女,1992年生,硕士生

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	余芳
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	陈康华
	王习锋
	刘德博
	马云龙
	黄诚
	鄢东洋
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https://www.cjmr.org/CN/10.11901/1005.3093.2017.766 或 https://www.cjmr.org/CN/Y2018/V32/I11/853

表1 Al-Cu-Mn铝合金化学成分

图1 取样示意图

表2 合金拉伸力学性能及IPA

图2 不同Cu含量Al-Cu-Mn铝合金的显微组织

表3 合金中Al2Cu相数目、平均尺寸以及面积分数

图3 不同Cu含量合金试样断口形貌

图4 合金试样断口的能谱分析

图5 合金L/T向试样拉伸断裂后厚度方向的显微组织

图6 Al-Cu-Mn合金的等温(541℃)等Zr(Zr=0.13%)截面相图

图7 合金中残余第二相及能谱分析

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