Surface nanocrystallization treatment of AZ91D magnesium alloy by cold spraying shot peening process
Surface nanocrystallization treatment of AZ91D magnesium alloy by cold spraying shot peening process
复制标题
冷喷涂喷丸工艺对AZ91D镁合金进行表面纳米化处理
DOI：
10.1016/j.surfcoat.2019.04.093
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发表时间：
2019-09
影响因子：
5.4
通讯作者：
Ji Gang Chang
中科院分区：
文献类型：
--
作者：
Wang Hong Tao;Yao Hai Long;Zhang Meng Xian;Bai Xiao Bo;Yi Zhi Hai;Chen Qing Yu;Ji Gang Chang
本文首次采用冷喷涂喷丸（CS-SP）新工艺对AZ 91 D镁合金进行表面纳米化处理。利用X射线衍射仪（XRD）、光学显微镜（OM）、扫描电镜（SEM）和透射电镜（TEM）研究了AZ 91 D镁合金表面SNC层的结构特征。利用显微硬度计测试了CS-SP处理后AZ 91 D镁合金试样的显微硬度分布。利用滑动磨损试验机研究了CS-SP处理前后AZ 91 D镁合金的磨损性能和摩擦系数。结果表明，采用CS-SP工艺可在AZ 91 D镁合金表面制备出厚度约为40 μm的SNC层。SNC层的平均晶粒尺寸在50-80 nm之间，在纳米晶层下存在大量的形变孪晶带。CS-SP处理后AZ 91 D镁合金的显微硬度随深度呈梯度分布，最外层的显微硬度值高达160 Hv0.025，约为基体的2倍。与未处理的AZ 91 D合金相比，CS-SP处理后的AZ 91 D合金具有更低的COF和更高的耐磨性。
In this paper, a new cold spraying shot peening (CS-SP) technology was used to produce surface nanocrystallization (SNC) of AZ91D magnesium alloy for the first time. The structure characteristics of SNC layer on AZ91D alloy were investigated by means of X-ray diffractometer (XRD), optical microscopy (OM), scanning electronic microscopy (SEM) and transmission electron microscopy (TEM), respectively. The microhardness distribution of AZ91D specimen after CS-SP treatment was tested by a microhardness tester. The wear property and the coefficient of friction (COF) of AZ91D alloy before and after CS-SP treatment were investigated using the sliding wear tester. Experimental results showed that SNC layer with thickness about 40 μm can be prepared on AZ91D alloy by the CS-SP process. The average grain size of SNC layer was in range of 50–80 nm and a large number of deformation twin bands existed beneath the nanocrystalline layer. The microhardness of AZ91D specimen after CS-SP treatment exhibited a gradient distribution with the depth and the microhardness value of the outermost layer was up to 160 Hv0.025about twice as that of the matrix. In comparison with the untreated one, the AZ91D alloy after CS-SP treatment showed the lower COF and the enhanced wear resistance.
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影响因子：
5.7
作者：
A. M. Vilardell;N. Cinca;I. G. Cano;A. Concustell;S. Dosta;J. Guilemany;S. Estradé;Alicia Ruiz-Caridad;F. Peiró
通讯作者：
A. M. Vilardell;N. Cinca;I. G. Cano;A. Concustell;S. Dosta;J. Guilemany;S. Estradé;Alicia Ruiz-Caridad;F. Peiró
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影响因子：
3.2
作者：
通讯作者：
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影响因子：
4.7
作者：
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通讯作者：
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