锻压技术

AZ31B镁合金热压缩力学行为与本构方程建立

英文标题：Mechanics behavior and constitutive equation of AZ31B magnesium alloy at hot compression

作者：陈拂晓郭云汉郭俊卿孙付涛

分类号：AZ31BAZ31B

出版年,卷(期):页码：2011,36(5):144-148

摘要：

根据对铸态AZ31B镁合金在温度为280～440℃、应变速率为0.001～0.1s-1条件下进行热压缩试验，分析了变形程度、应变速率和加热温度对其流动应力的影响，结果表明，该合金热变形时的流动应力对变形温度和变形速率极为敏感，随变形温度的升高而降低，随变形速率的增加而增大。在温度为440℃，应变速率小于0.01s-1时，材料出现稳态流动，流动应力不随变形量的变化而变化。在实验条件下，该合金的变形激活能为141.6kJ·mol-1。

Hot compression tests of AZ31B magnesium alloy were performed in the deformation temperature range from 280 to 440℃ and strain rate range from 0.001 to 0.1s-1. The influence of deformation, strain rate and deformation temperature on flow stress was also analyzed. The results show that the flow stress of this alloy is very sensitive to deformation temperature and str ain rate, and decreases as deformation temperature increasing, and increases with increasing of the stain rate. However, no significant change of flow stress is observed at the temperature of 440℃ and the strain rate below 0.01s-1. The hot deformation activation energy of the alloy is 141.6kJ·mol-1.

基金项目：

河南省科技攻关项目“镁合金轮毂精密成形技术”（072102230007）

参考文献：

[1]黎文献.镁及镁合金[M].长沙:中南大学出版社,2005.

[2]叶久新,陈明安.镁合金及其成型技术在工业中的应用[J].湖南大学学报,2002,29(3): 112-116.

[3]张土宏,王忠堂.镁合金的塑性加工技术[J].金属成形工艺,2002,21(5):1-4.

[4]Somekawa H, Konzu M, Tanabe S, et al. The press formability in magnesium alloy AZ31[J]. Mater. Sci. Forum, 2000，350351:177-182.

[5]Lee S, Chen Y H, Wang J Y. Isothermal sheet formability of magnesium alloy AZ31 and AZ61[J]. Journal of Materials Processing Technology, 2002, 124(12):19-24.

[6]陈振华，许芳艳，傅定发,等. 镁合金的动态再结晶[J]. 化工进展， 2006, 25(2): 140-146.

[7]Sheppard T , Parson N C ,Zaidi M A. Dynamic recrystallization in Al|7Mg[J]. Met.Sci., 1983 , 17(10):481.

[8]Sheng Z Q, Shivpur R. Modeling flow stress of magnesium alloys at elevated temperature[J]. Materials Science and Engineering, 2006，A419 ,202-208.

[9]罗吉荣,吴树森，夏巨谌，等.对当前镁合金研究与应用的几点认识[A]. 2001年中国压铸、挤压铸造、半固态加工学术年会论文集[C].烟台，2001.

[10]Sellars C M.Modeling microstructural development during hot rolling[J]. Materials Science and technology,1990, 6:1072.

[11]Milovic R, Manojlovic D, Andjelic M. Hot workability of M2 type high-speed steel[J]. Steel Research,1992, 63(2):78-84.

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