喷射沉积高Ca镁合金热变形行为研究

赵娜娜; 李振亮; 刘飞; 袁爱萍; 贾国栋; 杨苏冰

doi:10.15980/j.tzzz.2015.07.025

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喷射沉积高Ca镁合金热变形行为研究
Hot Deformation Behavior of High-Ca Magnesium Alloy Produced by Spraying Deposition
2015年35卷第7期页码：754-758
纸质出版日期： 2015 ，
DOI： 10.15980/j.tzzz.2015.07.025

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[1]赵娜娜,李振亮,刘飞,袁爱萍,贾国栋,杨苏冰.喷射沉积高Ca镁合金热变形行为研究[J].特种铸造及有色合金,2015,35(07):754-758.

Zhao Nana, Li Zhenliang, Liu Fei, et al. Hot Deformation Behavior of High-Ca Magnesium Alloy Produced by Spraying Deposition[J]. Special Casting & Nonferrous Alloys, 2015,35(7):754-758.
[1]赵娜娜,李振亮,刘飞,袁爱萍,贾国栋,杨苏冰.喷射沉积高Ca镁合金热变形行为研究[J].特种铸造及有色合金,2015,35(07):754-758. DOI： 10.15980/j.tzzz.2015.07.025.

Zhao Nana, Li Zhenliang, Liu Fei, et al. Hot Deformation Behavior of High-Ca Magnesium Alloy Produced by Spraying Deposition[J]. Special Casting & Nonferrous Alloys, 2015,35(7):754-758. DOI： 10.15980/j.tzzz.2015.07.025.

摘要

采用喷射沉积技术制备Mg-9Al-3Zn-1Mn-6Ca镁合金沉积坯

并对其进行挤压预变形和二次热压缩变形

研究热变形过程中再结晶、超塑性之间的微观组织演变。结果表明

二次热压缩变形后的镁合金在350℃、0.002s-1变形速率条件下

实现了镁合金超塑性压缩变形

外缘圆周伸长率达到103.96%;超塑性变形发生时伴随着动态再结晶发生

且当加工硬化速率与软化速率达到动态平衡时会出现压缩超塑性

350℃时变形速率是影响高Ca镁合金超塑性的主要因素。

Abstract

The Mg-9Al-3Zn-1Mn-6Ca alloy billets were produced by spraying deposition method（the Osprey process）.The microstructure evolution between recrystallization and superplasticity of the deposed billets prepared was observed during pre-deformation and compression deformation.The results show that the superplastic compression deformation can be observed at 350 ℃ and 0.002s-1

and the elongation of outer edge of circumferential reaches up to 103.96%.Superplastic behavior

in which the hardening rate and the dynamic softening rate realize dynamical equilibrium

is accompanied with the occurrence of dynamic recrystallization at 350 ℃

and the strain rate is the key to the superplastic compression deformation in hot-extruded magnesium alloys modified by high-Ca alloying.