朱堂葵,杨伟,吴宗锴,刘灵

• 1:义乌工商职业技术学院机电信息学院
• 2:南昌航空大学航空制造工程学院

摘要(Abstract)：

采用阶梯铜模喷铸制备了不同内径的亚快速凝固K424合金,采用时效处理研究了原始非平衡组织状态对快冷合金γ′析出相析出的影响。结果表明:铜模内径的降低可以减弱合金凝固过程中的溶质偏析程度,缩短相变时间,抑制共晶相及析出相形成,有利于获得高固溶组织。经700℃时效30 min处理后,?2合金由于形核驱动力高,临界形核半径小,相比?6合金优先析出γ′相。当时效温度提高到800℃,低内径铜模基体中可形成均匀分布的析出相,同时形核密度得到显著提高。随时效时间延长,γ′相先快速长大随后缓慢生长,其中?2合金由于γ′相过早析出导致其尺寸比相应的?6合金更大。析出相析出可以有效增加合金的显微硬度,经800℃时效180 min后?2合金硬度高达494 HV0.2,相比原始快冷合金提高13.8%。

关键词(KeyWords)： K424合金;冷却速率;非平衡凝固;铜模内径

Abstract:

Keywords:

基金项目(Foundation): 义乌工商职业技术学院重点科研项目(ZD2020CS414-02);; 国家自然科学基金(52061032,51461032);; 江西省教育厅资助项目(GJJ180513)

作者(Author): 朱堂葵,杨伟,吴宗锴,刘灵

DOI: 10.13289/j.issn.1009-6264.2020-0357

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