Understanding the Co-Poisoning Effect of Zr and Ti on the Grain Refinement of Cast Aluminum Alloys

被引：90

作者：

Qiu, D. ^{[1
,2
,3
]}

Taylor, J. A. ^{[1
,2
]}

Zhang, M. -X. ^{[1
,2
,3
]}

机构：

[1] Univ Queensland, Sch Mech & Min Engn, Brisbane, Qld 4072, Australia

[2] CAST Cooperat Res Ctr, Brisbane, Qld 4072, Australia

[3] ARC Ctr Excellence Design Light Met, Brisbane, Qld 4072, Australia

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2010年 / 41A卷 / 13期

基金：

澳大利亚研究理事会;

关键词：

CRYSTAL X-RAY; REFINING EFFICIENCY; AL; MECHANISM; CRYSTALLOGRAPHY; NUCLEATION; ZIRCONIUM;

D O I：

10.1007/s11661-010-0404-2

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The "co-poisoning" effect between Zr and Ti (derived from Al-Zr and Al-Ti-B master alloy additions) on the grain refinement of cast aluminum alloys is studied from a crystallographic atom matching viewpoint. The edge-to-edge matching (E2EM) model has been used to investigate the possible "poisoning" phase containing Zr/Ti, Al, and Fe in commercial grade aluminum alloys. The results show that Al3Ti is the most likely constituent to be poisoned due to the formation of an Al8Fe4Zr coating on its surface, since the Al8Fe4Zr phase has good crystallographic atom matching with Al3Ti, but not with the aluminum matrix. Meanwhile, the partial dissolution of Al3Zr nucleant particles to compensate for the loss of solute Zr aggravates the poisoning phenomenon. This proposed mechanism is consistent with most previous experimental observations and with existing practical solutions employed in the foundry.

引用

页码：3412 / 3421

页数：10

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