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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Grain size refinement in Mg-Al-based alloy by hydrogen treatment
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Grain size refinement in Mg-Al-based alloy by hydrogen treatment

机译：氢处理使Mg-Al基合金晶粒细化

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The present paper describes the grain size refinement of AZ31 alloys by means of the HDDR process. Hydrogenation was carried out at 250 approx 450 deg C under a hydrogen pressure of 7 MPa for 24 approx 36 h. Upon hydrogenation, the disproportionation reaction occurred, leading to the formation of MgH_2, Mg_(0.42)Al_(0.58), and Al phases. In the subsequent desorption process, the three phases were recombined, and the AZ31 alloy was recovered. As a result of the HDDR process, the grain size of the AZ31 alloy powders was reduced from 50 approx 300 mu m to about 100 nm in the case of the heat treatment at 350 deg C under a hydrogen pressure of 7 MPa for 24 h. The grain size tended to be increased with increasing process temperatures. In addition, the HDDR process was also applied to AZ31 alloy plates. By means of the HDDR process at 450 deg C, the grain size was reduced to less than 500 nm, while the layer thickness being treated was limited to the range of about 20 mu m from the surface after 36 hat 7 MPa pressure of H_2.
机译：本文描述了通过HDDR工艺细化AZ31合金的晶粒尺寸。在250约450℃，7 MPa的氢气压力下氢化24约36小时。氢化后发生歧化反应，导致形成MgH_2，Mg_（0.42）Al_（0.58）和Al相。在随后的解吸过程中，三相复合，并回收了AZ31合金。作为HDDR工艺的结果，在350℃，7MPa的氢气压力下进行24小时的热处理的情况下，AZ31合金粉末的晶粒尺寸从50大约300μm减小到大约100nm。晶粒尺寸倾向于随着加工温度的升高而增加。此外，HDDR工艺也应用于AZ31合金板。通过在450℃下的HDDR工艺，将晶粒尺寸减小至小于500nm，而在H 2的36帽压力为7MPa之后，被处理的层厚度被限制在距表面约20μm的范围内。

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