Mg--9Li--3Al--2.5Sr合金的热变形行为

材料研究学报

2012, Vol. 26

Issue (3): 309-314

研究论文

本期目录 | 过刊浏览

Mg--9Li--3Al--2.5Sr合金的热变形行为

李俊辰¹, 彭晓东^1,2, 刘军威¹, 杨艳¹, 曾利¹

1.重庆大学材料科学与工程学院重庆 400045
2.国家镁合金材料工程技术研究中心重庆 400044

Deformation Behavior of Alloy Mg–9Li–3Al–2.5Sr at Elevated Temperature

LI Junchen¹ , PENG Xiaodong^1,2 , LIU Junwei¹ , YANG Yan¹ , ZENG Li¹

1.College of Material Science and Engineering, Chongqing University, Chongqing 400045
2.National Engineering Research Center for Magnesium Alloys, Chongqing 400044

引用本文:

李俊辰彭晓东刘军威杨艳曾利 . Mg--9Li--3Al--2.5Sr合金的热变形行为[J]. 材料研究学报, 2012, 26(3): 309-314.
. Deformation Behavior of Alloy Mg–9Li–3Al–2.5Sr at Elevated Temperature[J]. Chin J Mater Res, 2012, 26(3): 309-314.

全文: PDF(1145 KB)

摘要: 使用Gleeble--1500D型热模拟试验机, 对挤压态Mg--9Li--3Al--2.5Sr合金进行热力模拟实验(变形温度为200--350℃, 应变速率为0.001--1 s^-1), 分析了材料的流变应力与变形温度和应变速率的关系, 建立了该合金热变形过程中的本构方程, 计算了该合金的热加工图, 并结合显微组织观察对加工图进行了分析。结果表明: 材料的流变应力随着应变速率的增加而增加, 随着温度的升高而下降；用双曲正弦函数关系式能很好地描述材料在热变形过程中的稳态流变应力；对热加工图的分析结果表明, 在实验参数范围内材料的最佳理论热加工区为260--300℃和0.01--1 s^-1。材料的超塑性加工区为340--350℃和0.003--0.01 s^-1。

关键词 ：金属材料, 镁合金, 热变形行为, 本构方程, 热加工图

Abstract：The uniaxial hot compression test with Gleeble–1500D thermal simulator had performed on Mg–9Li–3Al–2.5Sr alloy at 200–350℃ and strain rates of 0.001–1 s⁻¹. The correlation between the flow stress and the temperature and strain rates were analyzed, the constitutive equation of the alloy at elevated temperature was established, and the hot processing map of the alloy was also calculated and investigated by observing the microstructure. The results show that the flow stress becomes higher with increase of strain rates at constant temperature, and lower with increase of deformation temperature at constant strain rate. The steady flow stress of the alloy deformed at elevated temperature can be well described by the hyperbolic sine constitutive equation. The result of hot processing map shows that the optimal hot working parameters for the alloy Mg–9Li–3Al–2.5Sr is at 260–300℃ and strain of 0.01–1 s⁻¹, and the super–plastic deformation domain is at 340–350℃ and strain of 0.003–0.01 s⁻¹.

Key words： metallic materials, magnesium alloy hot deformation behavior constitutive equation processing map

收稿日期: 2012-04-11

ZTFLH:

TG146

基金资助:

国家重点基础研究发展计划项目2007CB613702和科技部国际合作项目2010DFR50010资助。

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