激光热处理对7075铝合金组织和性能的影响

doi:10.11901/1005.3093.2017.437

材料研究学报

2018, Vol. 32

Issue (4): 263-270 DOI: 10.11901/1005.3093.2017.437

研究论文

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激光热处理对7075铝合金组织和性能的影响

刘桐, 苏睿明(

), 曲迎东, 尤俊华, 白彦华, 李荣德

沈阳工业大学材料科学与工程学院沈阳 110870

Effect of Laser Heat Treatment on Microstructure and Mechanical Property of 7075 Al-alloy

Tong LIU, Ruiming SU(

), Yingdong QU, Junhua YOU, Yanhua BAI, Rongde LI

School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China

引用本文:

刘桐, 苏睿明, 曲迎东, 尤俊华, 白彦华, 李荣德. 激光热处理对7075铝合金组织和性能的影响[J]. 材料研究学报, 2018, 32(4): 263-270.
Tong LIU, Ruiming SU, Yingdong QU, Junhua YOU, Yanhua BAI, Rongde LI. Effect of Laser Heat Treatment on Microstructure and Mechanical Property of 7075 Al-alloy[J]. Chinese Journal of Materials Research, 2018, 32(4): 263-270.

全文: PDF(5811 KB) HTML

摘要:

以激光表面热处理代替回归再时效(RRA)中的回归过程,研究其对7075铝合金组织及性能的影响。结果表明,激光热处理可代替RRA中的回归部分,得到的7075铝合金的硬度具有双峰特征。在激光功率为850 W、扫描速度为2 mm/s条件下制备的7075铝合金的硬度达到第二峰。其硬度为181 HBW,数值最高,以氧化磨损为主。与第一峰的试样相比,表现出更高的硬度和耐磨性。析出的大量细小弥散的η'和η相,有利于7075铝合金的硬度和耐磨性的提高。

关键词 ：金属材料, 7075铝合金, 激光热处理, 微观组织, 硬度, 磨损机制

Abstract：

The effect of laser heat treatment, in stead of the retrogression process within the traditional retrogression and re-aging (RRA) treatment, on the microstructure and mechanical property of 7075 Al-alloy was investigated. The results show that the laser heat treatment can effectively replace the regression process of RRA. The hardness of the resulted 7075 Al-alloy exhibits the aging feature with double peaks. After pre-aging, laser treatment (850 W, 2 mm/s) and re-aging, the hardness of 7075 Al-alloy reaches the value of the second peak-aged ones with the highest hardness of 181 HBW, which then presented oxidation-wear character during wear test. The second peak-aged alloy possesses higher hardness and much better tribological performance than the first peak-aged ones. Which may be ascribed to the large number of fine precipitates of η'- and η-phase within the laser treated 7075 Al-alloy.

Key words： metallic materials 7075 aluminum alloy laser heat treatment microstructure hardness wear mechanism

收稿日期: 2017-07-19

基金资助:资助项目国家自然科学基金(51574167), 辽宁省博士启动资金(20170520337), 辽宁省创新团队项目(LT2015020)和辽宁省教育厅科学技术研究项目(LGD2016003)

作者简介:

作者简介刘桐,男,1994年生,硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2017.437 或 https://www.cjmr.org/CN/Y2018/V32/I4/263

表1 7075铝合金的化学成分(质量分数, %)

表2 7075铝合金时效处理

图1 不同激光扫描速度的LRRA处理和RRA处理试样的硬度平均值

图2 不同扫描速度的LRRA处理和RRA处理试样的硬度平均值

图3 7075铝合金激光处理试样层硬度分布曲线

图4 不同激光功率的LRRA处理和RRA处理试样的磨损量

图5 不同扫描速度的LRRA处理和RRA处理的试样的磨损量

图6 用不同热处理制备的7075铝合金的磨损表面形貌

图7 不同热处理的7075铝合金的X射线衍射图

图8 不同热处理制度的7075铝合金的组织

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