Nondendritic equiaxed zone formation in aluminum-lithium welds

被引：36

作者：

Gutierrez, A

Lippold, JC

Lin, WG

机构：

[1] OHIO STATE UNIV,COLUMBUS,OH 43210

[2] EDISON WELDING INST,COLUMBUS,OH 43212

来源：

ALUMINIUM ALLOYS: THEIR PHYSICAL AND MECHANICAL PROPERTIES, PTS 1-3 | 1996年 / 217卷

关键词：

aluminum-lithium alloys; nondendritic equiaxed grains; fusion boundary cracking; equiaxed zone; partially melted zone; unmixed zone; epitaxial growth;

D O I：

10.4028/www.scientific.net/MSF.217-222.1691

中图分类号：

T [工业技术];

学科分类号：

08 [工学];

摘要：

Aluminum-lithium welds have been found to be susceptible to fusion boundary cracking due to the presence of an unusual nondendritic equiaxed grain zone adjacent to the fusion boundary. In this paper, the nature of equiaxed zone (EQZ) formation is reported by studying the effect of the initial base metal microstructure. The EQZ was found to be strongly influenced by the base metal microstructure. No EQZ was observed in welds made on an as-cast substrate; however, welds on material in the T8 temper, annealed and as-cast/solution heat treated conditions all exhibited an EQZ. A unified mechanism for EQZ formation in AI-LI welds based on nondendritic solidification along the fusion boundary will be presented.

引用

页码：1691 / 1696

页数：6