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AZ91D镁合金表面纳米晶的热稳定性能研究

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摘要 本文着重研究了经过激光冲击强化(LSP)引起的AZ91D镁合金表面纳米晶层的热稳定性。透射电子显微镜(TEM)和X射线衍射装置(XRD)进行LSP后以表征AZ91D镁合金的微观结构的变化。用差热显示仪(DSC)和热重分析法(TGA)检测了非晶态镁合金在LSP后的结晶温度和焓。结果表明,经过激光冲击强化技术的镁合金AZ91D表面上产生的纳米晶尺寸平均为40~50nm。纳米晶可以在200℃之前保持稳定,并在200℃至300℃之间缓慢生长。当退火温度超过300℃时,处于亚稳态的纳米晶粒开始急剧生长,这主要是由于输入能量足以使晶界发生迁移。
作者 黄晶晶
出处 《科技风》 2021年第14期170-171,共2页
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