挤压态AZ81镁合金的热加工变形和加工图

曹凤红; 龙思远; 张勇; Gerald. S. Cole

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挤压态AZ81镁合金的热加工变形和加工图
Hot Deformation and Processing Maps of As-extruded AZ81 Magnesium Alloy
- 角色： First author 第一作者
- 机构：
  成都理工大学工程技术学院
  重庆大学材料科学与工程学院
曹凤红
1 2 ，
- 机构：
  重庆大学材料科学与工程学院
龙思远
2 ，
- 机构：
  3. 四川新蓉电缆有限公司 4. Light Weight Strategies LLC
张勇
3 ，
- 机构：
  3. 四川新蓉电缆有限公司 4. Light Weight Strategies LLC
Gerald. S. Cole
3
2011年31卷第3期页码：209-212
纸质出版日期： 2011 ，
DOI：

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引用
[1]曹凤红,龙思远,张勇,Gerald. S. Cole.挤压态AZ81镁合金的热加工变形和加工图[J].特种铸造及有色合金,2011,31(03):209-212+190.

Cao Fenghong1, Long Siyuan2, Zhang Yong3, et al. Hot Deformation and Processing Maps of As-extruded AZ81 Magnesium Alloy[J]. Special Casting & Nonferrous Alloys, 2011,31(3):209-212.
[1]曹凤红,龙思远,张勇,Gerald. S. Cole.挤压态AZ81镁合金的热加工变形和加工图[J].特种铸造及有色合金,2011,31(03):209-212+190. DOI：

Cao Fenghong1, Long Siyuan2, Zhang Yong3, et al. Hot Deformation and Processing Maps of As-extruded AZ81 Magnesium Alloy[J]. Special Casting & Nonferrous Alloys, 2011,31(3):209-212. DOI：

摘要

在Gleeble-1500D热模拟机上进行热压缩试验,研究了变形温度为320～440℃、应变速率为0.001～1.000s-1、最大变形程度为60%的条件下挤压态AZ81镁合金的高温热变形行为。热变形过程中的稳态流变应力可用双曲正弦本构关系式来描述,平均激活能为182.17kJ/mol,大于其自扩散激活能。根据材料动态模型,计算并分析了挤压态AZ81合金的热加工图,结合显微组织观察结果,分析了挤压态AZ81镁合金的热加工性能。在变形温度为320～440℃、应变速率为0.001～1.000s-1、最大变形程度为60%的条件下,失稳判据ξ（ε）>0,说明AZ81镁合金在该条件下塑性变形性能良好。并根据加工图获得了在试验参数范围内的热变形过程的最佳工艺参数范围,其热加工温度选在380～400℃、应变速率为0.010～0.100s-1时较好。

译

Abstract

Hot deformation behavior of as-extruded AZ81 magnesium alloy was investigated by compressive testing with the Gleeble-1500D thermal simulator at 320～440 ℃ and strain rate of 0.001～1s-1 with 60% deformation degree. The flow behavior can be described by the hyperbolic sine constitutive equation, and average activation energy reaches 182.17kJ/mol, higher than the activation energy for self-diffusion. The processing maps were calculated and analyzed according to the dynamic materials model. Combined with microstructure observation, process of hot deformation of as-extruded AZ81 magnesium alloy was analyzed. In conditions of 320～440℃ and strain rate of 0.001～1s-1 with 60% deformation degree, when instability criterion is more than zero, AZ81 magnesium alloy exhibits desirable hot deformation performance. Based on the processing maps, the optimized processing parameters range during hot deformation process were presented in the experimental parameters range, where hot deformation temperature was 380～400℃ and strain rate was 0.01～0.1s-1.

译

关键词

挤压态AZ81合金; 流变应力; 加工图; 热变形

译

Keywords

As-extruded AZ81 Magnesium Alloy; Flow Stress; Processing Maps; Hot Deformation

译

摘要

在Gleeble-1500D热模拟机上进行热压缩试验

研究了变形温度为320～440℃、应变速率为0.001～1.000s-1、最大变形程度为60%的条件下挤压态AZ81镁合金的高温热变形行为。热变形过程中的稳态流变应力可用双曲正弦本构关系式来描述

平均激活能为182.17kJ/mol

大于其自扩散激活能。根据材料动态模型

计算并分析了挤压态AZ81合金的热加工图

结合显微组织观察结果

分析了挤压态AZ81镁合金的热加工性能。在变形温度为320～440℃、应变速率为0.001～1.000s-1、最大变形程度为60%的条件下

失稳判据ξ（ε）>0

说明AZ81镁合金在该条件下塑性变形性能良好。并根据加工图获得了在试验参数范围内的热变形过程的最佳工艺参数范围

其热加工温度选在380～400℃、应变速率为0.010～0.100s-1时较好。

Abstract

and average activation energy reaches 182.17kJ/mol

higher than the activation energy for self-diffusion. The processing maps were calculated and analyzed according to the dynamic materials model. Combined with microstructure observation

process of hot deformation of as-extruded AZ81 magnesium alloy was analyzed. In conditions of 320～440℃ and strain rate of 0.001～1s-1 with 60% deformation degree

when instability criterion is more than zero

AZ81 magnesium alloy exhibits desirable hot deformation performance. Based on the processing maps

the optimized processing parameters range during hot deformation process were presented in the experimental parameters range

where hot deformation temperature was 380～400℃ and strain rate was 0.01～0.1s-1.