新型热处理调控<strong>Al-Cu-Mg</strong>合金残余应力的工艺和机理

doi:10.11901/1005.3093.2018.626

材料研究学报

2019, Vol. 33

Issue (6): 435-442 DOI: 10.11901/1005.3093.2018.626

研究论文

本期目录 | 过刊浏览

新型热处理调控Al-Cu-Mg合金残余应力的工艺和机理

马文静¹,陈志国^1,²(

),李鸿娟²,袁珍贵¹,郑子樵²(

)

1. 中南大学材料科学与工程学院长沙 410083
2. 湖南人文科技学院材料工程系娄底 417000

Process and Mechanism of Novel Heat Treatment for Controlling Residual Stress in Al-Cu-Mg Alloy

Wenjing MA¹,Zhiguo CHEN^1,²(

),Hongjuan LI²,Zhengui YUAN¹,Ziqiao ZHENG²(

)

1. School of Materials Science and Engineering, Central South University, Changsha 410083, China
2. Department of Materials Engineering, Hunan University of Humanities, Science and Technology, Loudi 417000, China

引用本文:

马文静,陈志国,李鸿娟,袁珍贵,郑子樵. 新型热处理调控Al-Cu-Mg合金残余应力的工艺和机理[J]. 材料研究学报, 2019, 33(6): 435-442.
Wenjing MA, Zhiguo CHEN, Hongjuan LI, Zhengui YUAN, Ziqiao ZHENG. Process and Mechanism of Novel Heat Treatment for Controlling Residual Stress in Al-Cu-Mg Alloy[J]. Chinese Journal of Materials Research, 2019, 33(6): 435-442.

全文: PDF(8658 KB) HTML

摘要:

对Al-Cu-Mg合金进行一种能消减残余应力的新型热处理，使用透射电镜(TEM)、扫描电镜(SEM)、X射线衍射等手段分析残余应力并测试力学性能，研究了这种合金的微观组织结构和性能。结果表明：新型热处理使Al-Cu-Mg合金的残余应力消减率达到92.7%(与固溶态铝合金相比)，并得到优良的强塑性配合(屈服强度达到463.6 MPa，抗拉强度达到502.5 MPa，伸长率达到12.7%)。微观组织的分析结果表明：在进行新型热处理的合金中S'相比用传统热处理的更为细小、分布更均匀，由S'相析出的共格应力场与淬火残余应力场叠加使合金残余应力大幅度降低，使合金的综合性能较高。

关键词 ：金属材料, Al-Cu-Mg, 新型热处理, 残余应力, 力学性能, 显微组织

Abstract：

The influence of a novel heat treatment process for reducing residual stress on the microstructure evolution and mechanical properties of Al-Cu-Mg alloy was investigated by means of transmission electron microscope, scanning electron microscope, X-ray diffractometer and tensile test. The results show that the residual stress reduction rate of Al-Cu-Mg alloy (compared with the solid solution treated one) reaches 92.7% by the novel heat treatment, while an excellent combination of strength and plasticity was acquired. As a result, the yield strength, ultimate tensile strength and the elongation rate of the alloy can reach 463.6 MPa, 502.5 MPa and 12.7% respectively. TEM observations reveal that the S′ precipitates are fine and uniformly distributed in the microstructure after the novel heat treatment. The synergistic effect of the coherency stress field produced by these S' phases and the quenching residual stress field may result in a significant reduction of the residual stress, which gives rise to the high comprehensive properties of Al-Cu-Mg alloy.

Key words： metallic materials Al-Cu-Mg novel heat treatment residual stresses mechanical properties microstructure

收稿日期: 2018-10-23

ZTFLH:

TG146.2

基金资助:国家自然科学基金(51011120052)

作者简介: 马文静，女，1992年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2018.626 或 https://www.cjmr.org/CN/Y2019/V33/I6/435

表1 合金的化学成分

表2 热处理工艺参数

图1 新型热处理的工艺流程

图2 不同状态下合金的残余应力

图3 与固溶态合金相比残余应力的消减率

表3 不同状态下合金的拉伸力学性能

图4 不同状态下合金的XRD谱

表4 不同状态下合金XRD相对衍射峰强度

图5 合金试样的拉伸断口形貌和典型第二相粒子的EDS谱

图6 不同制度热处理后合金的显微组织及对应的衍射斑

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