Evolution Mechanism of Al/AILi Eutectic Growth during Unidirectional Solidification

Peng DeIin An Geying

Views : 0 下载量: 129 CSCD: 2

Export
Share
Collection
Album

Evolution Mechanism of Al/AILi Eutectic Growth during Unidirectional Solidification
Issue 1, Pages: 1-3(2002)
Published： 2002 ，
DOI：

扫描看全文

[1]彭德林,,,,,,,,,,安阁英.定向凝固Al/AlLi共晶生长演化机制[J].特种铸造及有色合金,2002(01):1-3+3.

Peng DeIin An Geying. Evolution Mechanism of Al/AILi Eutectic Growth during Unidirectional Solidification. [J]. Special Casting & Nonferrous Alloys (1):1-3(2002)
[1]彭德林,,,,,,,,,,安阁英.定向凝固Al/AlLi共晶生长演化机制[J].特种铸造及有色合金,2002(01):1-3+3. DOI：

Peng DeIin An Geying. Evolution Mechanism of Al/AILi Eutectic Growth during Unidirectional Solidification. [J]. Special Casting & Nonferrous Alloys (1):1-3(2002) DOI：

摘要

在垂直向上定向凝固条件下

研究了二元亚共晶Al Li合金共晶凝固初期晶体生长演化机制。结果表明

工艺参数最佳配合时

初生晶体可以稳定地演化为规则的共晶生长 ;当工艺参数不当时

将引起熔体扰动

不能获得规则的共晶生长。预制合金的成分偏析是出现片层状共晶的主要原因。晶粒取向不同时

晶界表面能将引起晶体缺陷

Abstract

The evolution mechanism of crystal growth at the initial stage of eutectic solidification in binary hypoeutectic Al-Li alloy under vertical upward unidirectional solidification was studied. The research showed that the primary crystal would grow stably in the mode of regular eutectic at optimized technological parameters while the regular crystal growth couldn’t he obtained due to the disturbance of the melt at unsuitable prameters. The fomiation of lamellar eutectic was attributed to the compositional segregation in master alloy. Surface energy in the grain boundary will lead to crystal defect with different grain orientations.