An analysis of microstructure and impression creep response of squeeze-cast AZ91-xBi-ySr alloys

被引：2

作者：

Majhi, Jichil ^{[1
]}

Das, Tanmoy ^{[1
]}

Basu, A. ^{[1
]}

Mondal, A. K. ^{[2
]}

机构：

[1] Natl Inst Technol Rourkela, Dept Met & Mat Engn, Rourkela, India

[2] Indian Inst Technol BHU Varanasi, Dept Met Engn, Varanasi 221005, Uttar Pradesh, India

来源：

MATERIALS SCIENCE AND TECHNOLOGY | 2020年 / 36卷 / 06期

关键词：

AZ91 magnesium alloy; squeeze-casting; microstructure; intermetallic phase; impression creep; dislocation creep; dislocation pile-up; diffusion coefficient; MECHANICAL-PROPERTIES; MAGNESIUM ALLOY; BEHAVIOR; AZ91; ADDITIONS; AZ31;

D O I：

10.1080/02670836.2020.1736763

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The present investigation deals with the microstructural modification following the Bi + Sr additions to the squeeze-cast AZ91 alloy and its effect on impression creep response. The Bi + Sr additions form the Al4Sr and Sr2Bi phases besides the alpha-Mg and beta-Mg17Al12 phases, and improves creep resistance of the AZ91 alloy. The AZ91 + 1.0Bi + 0.5Sr alloy reveals the best creep resistance among the alloys. The stress exponent and the activation energy values of all the alloys are in the range of 4-7 and 100.2-112.7 kJ mol(-1), respectively, depicting the pipe diffusion-controlled dislocation creep is the governing creep mechanism. The post-creep microstructural study confirms several dislocations pile-ups around the Al4Sr and Sr2Bi phases resulting in improved creep resistance of the modified AZ91 alloys.

引用

页码：731 / 742

页数：12

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