Effect of heat treatment on fatigue behaviour of stir-cast EV31A magnesium alloy

被引：10
|
作者：
Somasundaram, M. [1 ]
Narendrakumar, U. [1 ]
Annamalai, A. Raja [2 ]
机构：
[1] Vellore Inst Technol, Sch Mech Engn, Dept Mfg Engn, Vellore 632014, Tamil Nadu, India
[2] Vellore Inst Technol, Ctr Innovat Mfg Res, Vellore 632014, Tamil Nadu, India
来源：
MATERIALS LETTERS | 2022年 / 313卷
关键词：
Cast; Fatigue; Metals and alloys; Magnesium alloy; Microstructure; MECHANICAL-PROPERTIES; EXTRUSION PARAMETERS; DEFORMATION-BEHAVIOR; CYCLIC DEFORMATION; MICROSTRUCTURE; AZ91D;
D O I：
10.1016/j.matlet.2022.131721
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The primary goal of this research is to investigate the fatigue properties of EV31A magnesium alloy under as-cast, T4, and T6 heat-treated conditions. The fatigue testing is carried out at an ambient temperature of 21-25 degrees C, with a stress ratio and frequency of 0.1 and 15 Hz, respectively. The linear intercept method is used to determine the grain size of the alloy under consideration. At a fatigue strength of 78.1 MPa, the as-cast must have a fatigue life of 1.6 x 10(5) cycles. T6 heat-treated sample has a 21% increase in fatigue compared to T4. The Transmission Electron Microscopy (TEM) method is useful for assessing the SAED pattern and interpreting precipitate morphology. The fractography reveals that the porosity of the stir-cast sample causes crack initiation, and the EV31A alloy fails in a transgranular mode.
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页数：4
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