Dendrite coherency point of A357 alloys

李建峰; 寇宏超; 王安家; 李金山; 胡锐; 傅恒志

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Dendrite coherency point of A357 alloys

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＜正＞The dendrite coherency point was determined for A357 alloys using double-thermocouples technique. The effects of the cooling rate and different treatments such as grain refinement, modification, and superheat on the dendrite coherency point were investigated. The results show that the increase of the cooling rate and refinement significantly postpones the coherency point of A357 alloys. The morphology of silicon phase is modified, which slightly leads to lower solid fraction （fs） at the coherency point. But the fscoh value decreases after superheat treatment at 850℃for 30 min. The grain size plays a decisive role in the fscoh value of A357 alloys. The smaller the grain size is, the more the fscoh value increases, which is beneficial to improving the final property of this alloy, while the secondary dendrite arm spacing and modification have almost no influence on fscoh.

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《中国有色金属学报：英文版》 |2006年第s3期|1532-1536|共5页
作者
李建峰; 寇宏超; 王安家; 李金山; 胡锐; 傅恒志;
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作者单位

State Key Laboratory of Solidification Processing Northwestern Polytechnical University;

Xi’an 710072;

China;

State Key Laboratory of Solidification Processing;

Northwestern Polytechnical University;

Xi’an 710072;

China;

State Key Laboratory of Solidification Pr;

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原文格式 PDF
正文语种 chi
中图分类金属物理学;
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机译：A357合金;枝晶相干点;冷却速率;熔融处理;

Dendrite coherency point of A357 alloys

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