铸态AZ61镁合金热压缩变形组织变化

材料热处理学报, 2009, 30(5): 39-43.

铸态AZ61镁合金热压缩变形组织变化

王少楠 ^1, , 唐国翌 ^2, , 傅万堂 ^3, , 吕知清 ^4, , 官磊 ^5,

1.清华大学深圳研究生院新材料研究所,广东,深圳,518055

2.清华大学深圳研究生院新材料研究所,广东,深圳,518055

3.燕山大学材料科学与工程学院,河北,秦皇岛,066004

4.燕山大学材料科学与工程学院,河北,秦皇岛,066004

5.清华大学深圳研究生院新材料研究所,广东,深圳,518055

基金项目: 国家自然科学基金(50571048)

关键词： AZ61镁合金 , 压缩变形 , 组织 , 再结晶

Microstructure in as-cast AZ61 magnesium alloy during hot compression deformation

利用GIeeble-1500对铸态AZ61镁合金在变形温度200～500℃,应变速率0.001～1s-1的条件下进行压缩变形;利用显微结构分析和硬度测试等研究不同变形条件下AZ61镁合金的组织和性能,引用Z值(Zener-Hoilomon系数)研究温度和应变速率对AZ61镁合金组织的影响,建立再结晶晶粒尺寸与z值之间的关系.结果表明:铸态AZ61镁合金在热变形时表现出动态再结晶特征,随温度上升,再结晶容易发生且峰值应力降低,再结晶晶粒尺寸随温度升高而增大;随应变速率上升,峰值应力增大且峰值应力对应的应变量增大,再结晶晶粒尺寸减小;硬度大小的变化也与动态再结晶密切相关.

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铸态AZ61镁合金热压缩变形组织变化

Microstructure in as-cast AZ61 magnesium alloy during hot compression deformation

参考文献