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深冷激光喷丸强化对2024-T351铝合金微观组织的影响

Effect of Cryogenic Laser Peening on Microstructure of 2024-T351 Aluminum Alloy

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摘要

探究了深冷激光喷丸(CLP)对2024-T351铝合金微观组织的影响及其强化机理,利用扫描电子显微镜和透射电子显微镜表征了2024-T351铝合金微观组织的演变规律。结果表明:相比于室温激光喷丸(RT-LP),CLP具有更加显著的晶粒细化效果,并在试样中产生了高密度位错以及更多、更细且均匀分布的黑色球状第二相,该相为S相(Al2CuMg);CLP试样的微观组织在深度方向上呈不同形貌的梯度分布,并且其基体层的微观组织优于RT-LP试样基体层的微观组织。CLP的强化机制主要包括两方面:一是深冷环境抑制位错的动态回复,并降低热激活能,从而促进了细化晶粒和第二相对位错的阻碍作用;二是深冷环境下试样的体积收缩效应产生的塑性变形和内应力,它们会产生显著的组织强化效果。

Abstract

The effect of cryogenic laser peening (CLP) on the microstructure of 2024-T351 aluminum alloy and its strengthening mechanism are investigated. The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) are used to characterize the microstructure evolution of 2024-T351 aluminum alloys. Results show that when compared with room-temperature laser peening (RT-LP), CLP has a more remarkable grain refinement effect and produces high-density dislocation. Additionally, CLP results in more and finer black spherical second phases, which are uniformly distributed throughout the samples and can be analyzed using EDS as the S phase (Al2CuMg). The in-depth microstructures of the samples treated by CLP are shown to have gradient distributions with different morphologies, and the microstructures of the matrix layer of these samples are superior to those obtained from samples subjected to RT-LP. There are two main strengthening mechanisms associated with CLP: one is that the cryogenic environment restrains the dynamic recovery of dislocations,reducing the thermal activation energy needed to promote the inhibitory effect of refined grains and second phases on dislocations; the other mechanism is related to the fact that the plastic deformation and internal stress caused by the volume shrinkage of samples under cryogenic environment can significantly produce structural strengthening effects.

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DOI:10.3788/CJL201946.0902004

所属栏目:激光制造

基金项目:国家自然科学基金、江苏大学工业中心大学生创新实践基金;

收稿日期:2019-03-07

修改稿日期:2019-05-14

网络出版日期:2019-09-01

作者单位    点击查看

田绪亮:江苏大学机械工程学院, 江苏 镇江 212013
周建忠:江苏大学机械工程学院, 江苏 镇江 212013
李京:江苏大学机械工程学院, 江苏 镇江 212013
孟宪凯:江苏大学机械工程学院, 江苏 镇江 212013
孙昀杰:江苏大学机械工程学院, 江苏 镇江 212013
黄宇:江苏大学机械工程学院, 江苏 镇江 212013
黄舒:江苏大学机械工程学院, 江苏 镇江 212013

联系人作者:田绪亮(zhoujz@ujs.edu.cn); 周建忠( zhoujz@ujs.edu.cn);

备注:国家自然科学基金、江苏大学工业中心大学生创新实践基金;

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引用该论文

Xuliang Tian,Jianzhong Zhou,Jing Li,Xiankai Meng,Yunjie Sun,Yu Huang,Shu Huang. Effect of Cryogenic Laser Peening on Microstructure of 2024-T351 Aluminum Alloy[J]. Chinese Journal of Lasers, 2019, 46(9): 0902004

田绪亮,周建忠,李京,孟宪凯,孙昀杰,黄宇,黄舒. 深冷激光喷丸强化对2024-T351铝合金微观组织的影响[J]. 中国激光, 2019, 46(9): 0902004

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