Dynamic softening behaviour of AZ80 magnesium alloy during upsetting at different temperatures and strain rates

doi:10.1243/09544054JEM1965

CQUET-IR

	Dynamic softening behaviour of AZ80 magnesium alloy during upsetting at different temperatures and strain rates
	Zheng, Q.G.1; Ying, T.2; Jie, Z.1
	2010-11-01
发表期刊	PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE
ISSN	0954-4054
卷号	224 期号:11 页码:1707-1716
摘要	In order to evaluate the dynamic softening characteristics of casting AZ80 magnesium alloy, isothermal upsetting experiments with a height reduction of 60 per cent were performed at temperatures 523, 573, 623, and 673 K, at strain rates of 0.01, 0.1, 1, and 10 s-1 on thermal physics simulator Gleeble 1500. The flow behaviour of the applied stress as a function of strain, strain rate, and temperature exhibited a more pronounced effect of temperature than strain rate, and a typical softening characteristic. A Fields-Backofen constitutive equation was introduced to describe this behaviour, while the flow stress calculated could not provide a fit to the measured stress-strain relationship at the dynamic softening stage. Based on the relationships established between yield stress and recrystallization grain refinement under different strain rates and temperatures, the softening behaviour was illustrated. An amended mathematical model containing an item s was introduced to characterize the dynamic recrystallization softening behaviour. Compared with the Fields-Backofen equation, the resulting flow curves calculated by the amended model offered a better representation during the softening stage.
关键词	Dynamic recrystallization Fracture energy Grain refinement Grain size and shape Magnesium alloys Magnesium castings Stress strain curves Upsetting (forming) Yield stress AZ80 magnesium alloy Dynamic softening Effect of temperature Height reduction Recrystallization grains refinement softening behaviour Stress-strain relationships
DOI	10.1243/09544054JEM1965
收录类别	EI ; SCIE
语种	英语
WOS研究方向	Engineering
WOS类目	Engineering, Manufacturing ; Engineering, Mechanical
WOS记录号	WOS:000284573600009
出版者	SAGE Publications Ltd
EI入藏号	20104813444386
EI分类号	531.1 Metallurgy ; 534.2 Foundry Practice ; 535.2 Metal Forming ; 542.2 Magnesium and Alloys ; 931.1 Mechanics ; 951 Materials Science
原始文献类型	Journal article (JA)
出版地	WESTMINISTER
引用统计	被引频次：28[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	https://ir.cqcet.edu.cn/handle/39TD4454/2993
专题	重庆电子科技职业大学
作者单位	1.Material Processing and Controlling, School of Material Science and Engineering, Chongqing 400044, China; 2.Department of Mechatronics Engineering, Chongqing College of Electronic Engineering, Chongqing, China
推荐引用方式 GB/T 7714	Zheng, Q.G.,Ying, T.,Jie, Z.. Dynamic softening behaviour of AZ80 magnesium alloy during upsetting at different temperatures and strain rates[J]. PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE,2010,224(11):1707-1716.
APA	Zheng, Q.G.,Ying, T.,&Jie, Z..(2010).Dynamic softening behaviour of AZ80 magnesium alloy during upsetting at different temperatures and strain rates.PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE,224(11),1707-1716.
MLA	Zheng, Q.G.,et al."Dynamic softening behaviour of AZ80 magnesium alloy during upsetting at different temperatures and strain rates".PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE 224.11(2010):1707-1716.