Solidification behaviour of an AA5754 Al alloy ingot cast with high impurity content

被引：17

作者：

Kumar, Sundaram ^{[1
]}

Babu, Nadendla Hari ^{[1
]}

Scamans, Geoff M. ^{[1
]}

Eskin, Dmitry G. ^{[1
]}

Fan, Zhongyun ^{[1
]}

机构：

[1] Brunel Univ, BCAST, LiME, EPSRC Ctr, Uxbridge UB8 3PH, Middx, England

来源：

INTERNATIONAL JOURNAL OF MATERIALS RESEARCH | 2012年 / 103卷 / 10期

基金：

英国工程与自然科学研究理事会;

关键词：

Al-Mg alloy; Impurity; Grain refiner; Recycling; Al2CuMg; GRAIN-REFINEMENT; HETEROGENEOUS NUCLEATION; LIQUID DROPLETS; ROSETTES;

D O I：

10.3139/146.110760

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

In view of the recycling of aluminium scrap for automotive sheet application, we have investigated the solidification behaviour of AA5754 alloy containing additional amounts of impurity elements such as Si, Fe, and Cu. Ingot casts with a high impurity content resulted in coarse alpha-Al dendrites and complex-shaped secondary phases. A large volume of coarse Chinese script and needle-type Fe-bearing intermetallic phases were observed to form at the centre of an ingot. In addition to the grain-boundary eutectic, spherically shaped rosette-type eutectic phases were observed within the Al grain in the high-impurity alloy. The more uniform size distribution of the Fe-bearing intermetallics observed in the Al-Ti-B grain refined alloy is attributed to the presence of a large fraction of a-Al grain boundaries which distributes the eutectic liquid where the Fe-bearing intermetallic forced to nucleate and grow.

引用

页码：1228 / 1234

页数：7

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