Modification of microstructures for hypoeutectic, eutectic and hypereutectic Al-Cu binary alloys

被引：8

作者：

El-Labban, H. F. ^{[1
]}

Mahmoud, E. R. I. ^{[2
]}

机构：

[1] Univ Alexandria, Fac Engn, Dept Prod Engn, Alexandria, Egypt

[2] CMRDI, Mfg Technol Dept, Welding & NDT Lab, Cairo, Egypt

来源：

INTERNATIONAL JOURNAL OF CAST METALS RESEARCH | 2015年 / 28卷 / 02期

关键词：

Chemical grain refinement; Al-Ti5-B1 master alloy; Al-Cu phase diagram; Heat treatments; Differential thermal analysis; IN-SITU SYNTHESIS; MECHANICAL-PROPERTIES; GRAIN-REFINEMENT; COOLING RATE; MG ALLOYS; SOLIDIFICATION; ALUMINUM; BEHAVIOR; SYSTEM; COMPOSITES;

D O I：

10.1179/1743133614Y.0000000136

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Al-Cu alloys of compositions near eutectic point [hypoeutectic (Al-19Cu), eutectic (Al-33Cu) and hypereutectic (Al-35 center dot 5Cu) and (Al-36Cu)] were chemically modified by adding 0.6 wt-% Al-Ti5-B1 master alloy. In addition, the specimens of unmodified and chemically modified eutectic alloy were heat treated at 500 degrees C for different holding times (4, 24, 48 and 72 h for the unmodified and 4 and 29 h for the modified ones) followed by water quenching. The structure of chemically treated alloy was changed from large dendrites to fine rosette shaped alpha-Al grains inside fine eutectic matrix. For these alloys, the liquid-solid transformation temperature was shifted to a higher value. The addition of Al-Ti5-B1 master alloy to the eutectic (Al-33Cu) alloy transforms it into hypoeutectic one of fine lamellar eutectic structure. The chemically treated hypereutectic alloy (Al-35% 5Cu) was changed into full eutectic alloy.

引用

页码：81 / 88

页数：8

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