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The hot compressive deformation of extruded AZ31 magnesium alloy with the mass fractions of Al and Zn equal to 3%and 1% respectively is studied by a Gleeble-1500D thermal mechanical simulator over the temperature range from 200℃to 400℃ and the strain rate from 10^-3 s^-1 to 10^0s^-1.The true stress-strain curves of the strain of 65% are tested.The deformation activation energy is obtained and the flow stress model is established by analyzng the effects of strain rate and temperature on the flow stress.Zener-Hollomon parameter is introduced to describe the softening behaviors of AZ31 magnesium alloy resulted from dynamic recrystallization during the hot compressive deformation,whose natural logarithm is linear with the critical strain of dynamic recrystallization. 相似文献
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汪凌云 《重庆大学学报(英文版)》2002,(2)
Magnesium and magnesium alloys, which have a density of 1.74 g cm-3, are the lightest structural metal. In addition to being extremely light, magnesium alloys have many advantages such as high specific strength and high specific rigidity [1-3]. Magnesium alloys have been paid more and more attention in recent years. A few die castings of magnesium alloys have been applied to automobile industry. Magnesium alloys have huge potentiality of application to automobile, motorcycle, aviation, spacefl… 相似文献
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汪凌云 《重庆大学学报(英文版)》2003,2(1)
1. Introduction Magnesium is the lightest metal structural material with low density and many strong points. Compared with its cast counterpart, the wrought magnesium alloy has found more promising perspective of application in many fields such as automobiles, aeronautics and electronic communication [1]. The application of magnesium has been greatly constrained by its low ductility at room temperature due to its hexagonal closest packing (hcp) crystal structure (the regular cast magnesium all… 相似文献
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汪凌云 《中国教育发展研究杂志》2008,5(3):87-88
建设社会主义新农村,是党中央以科学发展观为指导,根据我国总体上进入“以工促农、以城带乡”发展阶段后的形势要求以及现代化建设远景目标所提出的一项长期历史任务。因此,建设新农村,不能短打算,而要长远谋划,落实任务时,要抓好开局,从紧迫的事做超,并依据生产力发展和财力增长的状况,逐步推进。防止盲目蛮干,拔苗助长,尤其不能以搞运动的方式搞建设,如果大轰大嗡,层层加码压指标,相互攀比赶进度,甚至为了达标而不惜举债,那会适得其反。这就要求我们在工作中必须认真领会和严格执行中央精神,做到“五坚持”、“五要五不要”,从而处理好推进社会主义新农村建设的若干关系。 相似文献
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