Effect of precipitation on internal friction of AZ91 magnesium alloy

The effect of precipitation on the internal friction（IF）of AZ91 magnesium alloy was investigated by using X-ray diffraction（XRD）analysis,scanning electron microscope（SEM）observation,and dynamic mechanical analysis（DMA）.Six different states of alloy were prepared by applying different heat treatment...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2010-07, Vol.20 (B07), p.453-457
Main Author: 刘树伟 姜海昌 李秀艳 戎利建
Format: Article
Language:English
Subjects:
aging
AZ91镁合金
Dynamic tests
Grain boundaries
Internal friction
isothermal treatment
Magnesium base alloys
Precipitation
Scanning electron microscopy
Solid solutions
solutionization
Thermal relaxation
X射线衍射分析
不连续析出
不连续沉淀
动态力学分析
弛豫内耗峰
扫描电子显微镜
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Summary:The effect of precipitation on the internal friction（IF）of AZ91 magnesium alloy was investigated by using X-ray diffraction（XRD）analysis,scanning electron microscope（SEM）observation,and dynamic mechanical analysis（DMA）.Six different states of alloy were prepared by applying different heat treatment processes：as-cast,in-complete solid solution,complete solid solution,micro-precipitation,continuous precipitation and continuous-discontinuous precipitation.It was found that the internal friction of in-completely solid-solutionized,completely solid-solutionized and micro-precipitated specimens showed a similar characteristic,and the grain boundary relaxation is completed depressed due to the Al atoms supersaturated in theα-Mg solution.However,a thermal relaxation internal friction peak was observed for continuously precipitated and continuously-discontinuously precipitated specimens at around 438 K and frequency of about 1 Hz,which was attributed to the grain boundaries relaxation.Furthermore,it was found that the relaxation of theβ-Mg17Al12/α-Mg phase interfaces should give its contribution to the background internal friction in the as-cast,continuously precipitated and continuously-discontinuously precipitated specimens.
ISSN:1003-6326
DOI:10.1016/S1003-6326(10)60517-1