李明,杨文龙,张玉,李元东

• 1:河西学院物理与机电工程学院
• 2:河西学院先进材料成形技术研究所
• 3:兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室

摘要(Abstract)：

采用自孕育制浆结合高压压铸制备了AZ91D镁合金流变压铸件,研究了浆料保温时间对其凝固组织及力学性能的影响,采用能谱分析了液态压铸和半固态压铸组织及成分差异的原因,利用光学显微镜和扫描电镜观察了压铸件不同部位的凝固组织。结果表明:自孕育流变压铸能够细化AZ91D镁合金液态压铸组织,获得近球状初生α-Mg晶粒,且自孕育流变压铸过程形成的二次α-Mg晶粒相比液态压铸过程形成的细小激冷晶,Al元素含量显著升高;浆料保温时间只影响流变压铸件初生α-Mg晶粒,不影响二次凝固组织;采用自孕育流变压铸能够显著提高压铸件力学性能,并在保温3 min时达到最佳综合力学性能。

关键词(KeyWords)： AZ91D镁合金;自孕育;流变压铸;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51464031);; 河西学院青年基金(QN2018011)

作者(Author): 李明,杨文龙,张玉,李元东

DOI: 10.13289/j.issn.1009-6264.2020-0136

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