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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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时效对mg-y-nd合金的影响
Keywords: 金属材料,mg-y-nd合金,时效硬化,沉淀相
Abstract:
？研究了mg-y-nd合金时效过程中的硬化软化现象。在时效初期(473k/2h左右)出现了一次明显的时效硬化峰，之后硬度急剧下降；然后合金的硬度缓慢增加，出现小幅二次硬化现象；523k/600h后，合金出现软化现象。微观结构的分析结果表明，初次时效峰是合金中析出了5nm大小的mgy弥散分布沉淀相所致；随后弥散相溶解消失，材料出现软化；在时效过程中β沉淀相的析出、增多和板条状组织的形成导致材料二次硬化。长时间时效后β沉淀相的聚集长大，以及在α/β界面产生纳米晶mgo区导致材料再次软化。
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