Modeling dendritic structure and mechanical properties of Zn-Al alloys as a function of solidification conditions
Modeling dendritic structure and mechanical properties of Zn-Al alloys as a function of solidification conditions
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DOI：
10.1016/s0921-5093(01)01455-1
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发表时间：
2002-02-28
期刊：
影响因子：
6.4
通讯作者：
Garcia, A
中科院分区：
文献类型：
--
作者：
Osório, WR;Garcia, A
本文就锌铝合金铸件的力学性能、显微组织和凝固参数之间的关系，指出了一些重要的发展趋势。一些理论的枝晶生长模型，表示作为尖端生长速率或局部凝固时间的函数的二次间距，已被测试对非稳态凝固过程中获得的实验数据。基于这些枝晶模型，在描述二元合金的定向凝固中的固相线和液相线等温线的位置的解析表达式和关于铸造样品的拉伸测试的实验结果上，已经开发了允许极限和屈服强度，枝晶二次间距和凝固工艺变量之间的相关性的表达式。(C)2002 Elsevier Science B.V.保留所有权利。
In the present article, some important trends have been shown regarding the relationship between mechanical properties, microstructure and solidification variables of Zn-Al alloys castings. Some theoretical dendritic growth models, expressing secondary spacings as function of tip growth rate or local solidification time, have been tested against experimental data obtained during unsteady-state solidification. Based on these dendritic models, on analytical expressions describing the position of solidus and liquidus isotherms in the unidirectional solidification of binary alloys and on experimental results concerning tensile testing of casting samples, expressions have been developed permitting a correlation between ultimate and yield strength, dendrite secondary spacings and solidification processing variables. (C) 2002 Elsevier Science B.V. All rights reserved.