局部挤压慢压射A356压铸件的微观组织与冲击性能

中国有色金属学报, 2010, 20(3): 442-450.

局部挤压慢压射A356压铸件的微观组织与冲击性能

白砚飞 ^1, , 赵海东 ^2, , 李元元 ^3, , 康志新 ^4,

1.华南理工大学,国家金属材料近净成形工程技术研究中心,广州,510640

2.华南理工大学,国家金属材料近净成形工程技术研究中心,广州,510640

3.华南理工大学,国家金属材料近净成形工程技术研究中心,广州,510640

4.华南理工大学,国家金属材料近净成形工程技术研究中心,广州,510640

基金项目: 新世纪优秀人才支持计划(NCET-08-0209) 国家高技术研究发展计划(863计划)(2008AA03A239) 广东省自然科学基金(05006498)

关键词： A356压铸件 , 慢压射压铸 , 微观组织 , 冲击性能

Microstructure and impact properties of slow injection A356 die castings with partial squeeze

研究局部挤压慢压射A356压铸件不同部位处的微观组织及冲击性能.结果表明:铸态下共晶Si粒子大多为纤维状或长针状,呈不均匀的网状分布,冲击吸收功在1.17～2.35 J的范围内变化后;经T6热处理后,团簇状Al-Si共晶相明显减少,共晶Si粒子呈现出粒状或短棒状,且细小均匀,Si粒子的长宽比和面积分数都有显著降低,冲击吸收功在1.45～3.80 J的范围内变化,比铸态有明显提高.分析2种情况下不同部位处的断裂方式,数学回归分析表明,冲击性能由二次枝晶间距和Si粒子长宽比共同决定.

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局部挤压慢压射A356压铸件的微观组织与冲击性能

Microstructure and impact properties of slow injection A356 die castings with partial squeeze

参考文献