Effects of Mg and RE additions on the semi-solid microstructure of a zinc alloy ZA27

被引：47

作者：

Chen, T. J. ^{[1
,2
]}

Hao, Y. ^{[1
]}

Sun, J. ^{[2
]}

Li, Y. D. ^{[1
]}

机构：

[1] Lanzhou Univ Technol, State Key Lab Gansu New Nonferrous Met Mat, Lanzhou 730050, Peoples R China

[2] Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China

来源：

SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS | 2003年 / 4卷 / 06期

关键词：

ZA27; alloy; Semi-solid; Isothermal holding; Magnesium and rare earth additions; Microstructure;

D O I：

10.1016/j.stam.2004.01.002

中图分类号：

T [工业技术];

学科分类号：

08 [工学];

摘要：

The effects of 2 mass% Mg and 0.8 mass% RE additions on the microstructural evolution of a Zr modified zinc alloy ZA27 during isothermal holding at semi-solid temperature of 460 degrees C have been studied by optical microscope and scanning electron microscope. Results show that these two elements all decrease the coarsening rate of solid primary particles, and improve the uniformity of particle size. The addition of Mg greatly decreases the solid fraction, and then increases the distance between particles. However, the element of RE mainly concentrates at the liquid regions between particles, and hinders both the atom diffusion and the welding of contact particles. In addition, the behaviors of particle coarsening of these two alloys, together with that of the Zr modified ZA27 alloy without the other elements, obey the LSW law after the three semi-solid systems reach at their solid-liquid equilibrium states. The additions of these two elements have no visible effect on the shape factor of particles. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：495 / 502

页数：8

共 20 条

[1]

Arnberg L, 1999, MAT SCI ENG A-STRUCT, V262, P300

[2]

Microstructural evolution of previously deformed ZA27 alloy during partial remelting [J].