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A6061-T6铝合金经超声表面纳米化后的显微组织和性能
          
Microstructure and Properties of A6061-T6 Aluminium Alloy after Ultrasonic Nanocrystal Surface Modification

摘    要
利用超声表面纳米化技术(UNSM), 采用两组静态载荷(15, 30 N)分别对A6061-T6铝合金表面进行处理获得强塑性变形层, 利用光学显微镜、扫描电子显微镜和X射线衍射仪研究了由表面到基体的组织结构变化, 并通过疲劳试验研究了合金的疲劳性能的变化。结果表明: 载荷较大时, 合金表面强塑性变形层深度和表面硬度均较大, 表面残余压应力也大; 超声表面纳米化处理后, 试样表面粗糙度降低, 合金表面获得等轴状且取向随机分布的纳米晶组织; 处理后合金的疲劳破坏为剪切裂纹萌生机制, 而处理前的为近表面微空洞或微缺陷处萌生机制。
标    签 超声表面纳米化   铝合金   显微组织   ultrasonic nanocrystal surface modification   aluminum alloy   microstructure  
 
Abstract
A severe plastic deformation (SPD) layer on the surface of A6061-T6 aluminum alloy was obtained by ultrasonic nanocrystal surface modification (UNSM) technique at static loads of 15 N and 30 N. The microstructure from surface to matrix was examined using optical microscopy, scanning electron microscopy and X-ray diffraction. Fatigue performance of the alloy was also studied by fatigue testing. The results show that the deep of SPD layer, surface hardness and surface residual compressive stress increased with the increase of static load. After being treated by UNSM technique, the surface roughness of samples declined, and the surface microstructure were isometric and random oriented nano-crystals. The fatigue fracture of A6061-T6 after UNSM showed the shearing crack initiation mechanism instead of typical subsurface facet or micro-void initiation mode before UNSM.

中图分类号 TG176 TG146.2

 
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所属栏目 材料性能及其应用

基金项目 国家自然科学青年基金资助项目(11202108); 教育部创新团队项目(IRT1027); 南通大学引进人才项目(03080453)

收稿日期 2013/7/25

修改稿日期 2014/7/20

网络出版日期

作者单位点击查看

备注曹小建(1983-), 男, 江苏南通人, 讲师, 博士。

引用该论文: CAO Xiao-jian,LEE Chan-joo,SUH Chang-min,PYOUN Young-shik,WANG Qing-yuan,MURAKAMI Ri-ichi. Microstructure and Properties of A6061-T6 Aluminium Alloy after Ultrasonic Nanocrystal Surface Modification[J]. Materials for mechancial engineering, 2014, 38(10): 74~78
曹小建,李璨柱,苏昌敏,卞英植,王清远,村上理一. A6061-T6铝合金经超声表面纳米化后的显微组织和性能[J]. 机械工程材料, 2014, 38(10): 74~78


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