文章基本信息

标题：Creep behaviour of Deep Cryogenic Treated AZ91 Magnesium alloy
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作者：E. Gariboldi ; Q. Ge ; N. Lecis 等
期刊名称：Metallurgical Science and Tecnology
印刷版ISSN：0393-6074
出版年度：2012
卷号：30
期号：2
语种：English
出版社：Metallurgical Science and Tecnology
摘要：The Deep Cryogenic Treatment (DCT) is known to havebeneficial effects on mechanical behavior/properties ofsome alloys. It was also reported to be beneficial for thecreep strength of Mg alloys. The present study is aimedat checking the effect of DCT on the high temperaturebehaviour of the Mg alloy AZ91 by means of comparativecreep tests at 100 and 200°C carried out on high pressuredie-cast specimens. In addition, the role played by initialmicrostructure was investigated by comparative creeptests on annealed and solution treated specimens. Themechanical tests were joined to optical and scanningelectron microscopy observations on the creep specimensprior and after their high temperature exposure and toDifferential Scanning Calorimetry analyses to investigatethe thermal stability and the microstructural evolution ofthe alloy. The investigations results demonstrated that theeffect of initial microstructure is by far more important forthe creep properties of the Az91 alloy than the cryogenictreatment. DSC analyses revealed to be a useful tool toget information on the microstructural stability in view ofthe development of microstructure-based creep models