文滔,王建华,杨志增,郭启强,李雪梅,苏旭平

• 1:常州大学材料科学与工程学院
• 2:湘潭大学机械工程学院
• 3:常州大学常州市先进金属材料重点实验室

摘要(Abstract)：

将0.5 g初始铸态Al-21%Si合金真空封装于14 mm的石英管中,分别在750、800、850和900℃温度下重熔并保温不同时间后水冷,采用光学显微镜分析Al-21%Si合金凝固组织。结果表明:Al-21%Si合金在750～850℃重熔保温20 min后初晶硅比初始铸态合金中的更大,但随着重熔温度的升高,初晶硅的颗粒尺寸逐渐减小,900℃温度下重熔时效果最好;在750℃重熔后初晶硅反而变粗,保温时间对初晶硅颗粒的尺寸影响不明显;在相对较慢的石英管水冷条件下,Al-21%Si合金中的共晶硅比初始铸态组织中的共晶硅更加细小;在750～900℃温度范围内保温不同的时间后,初晶硅的颗粒尺寸基本在25～43μm范围内波动;在800、850和900℃保温时均出现了不同生长程度的五瓣星形初晶硅组织。

关键词(KeyWords)： 过热温度;保温时间;Al-21%Si合金;初晶硅;凝固组织

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51074030);; 湖南省大学生创新基金,青蓝工程资助

作者(Author): 文滔,王建华,杨志增,郭启强,李雪梅,苏旭平

DOI: 10.13289/j.issn.1009-6264.2012.04.010

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