刘亮,张丽攀,杨伟,蔡长春

• 1:南昌航空大学轻合金加工科学与技术国防重点学科实验室

摘要(Abstract)：

采用铜模喷铸快冷法制备了添加纳米SiC的AZ91镁合金试样,研究不同固溶工艺对其组织及性能的影响。结果表明:铜模激冷与纳米SiC的添加可共同促进快冷镁合金的凝固组织发生细化,形成细小均匀的粒状晶形貌。经320℃等温处理8 h后,快冷AZ91+2 mass%纳米SiC合金发生不完全固溶现象,晶界处存在大量β-Mg_(17)Al_(12)相,同时晶粒内部形成弥散分布的沉淀析出相。随固溶温度提高,原子扩散速率的增加有利于β相向α-Mg基体中溶入,经370℃/4 h等温热处理后固溶效果明显,非平衡凝固组织基本转变为多边形等轴晶形貌。当固溶温度进一步升高到400℃时快冷镁合金中可获得单相固溶体组织,同时纳米SiC的存在有效提高了细晶组织的热稳定性,快冷合金的平均晶粒尺寸仅为9μm,高温晶粒长大行为得到有效抑制。

关键词(KeyWords)： 镁合金;非平衡凝固;固溶处理;组织细化;晶粒长大

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(51461032);; 江西省教育厅资助项目(GJJ14504)

作者(Author): 刘亮,张丽攀,杨伟,蔡长春

DOI: 10.13289/j.issn.1009-6264.2018-0349

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