添加Mn、Sc元素对Mg-9Gd-4Y合金组织和力学性能的影响

材料热处理学报, 2006, 27(2): 42-46. doi: 10.3969/j.issn.1009-6264.2006.02.011

添加Mn、Sc元素对Mg-9Gd-4Y合金组织和力学性能的影响

陈健美 ^1, , 张新明 ^2, , 熊创贤 ^3, , 蒋浩 ^4, , 邓桢桢 ^5,

1.中南大学材料科学与工程学院,湖南,长沙,410083;湖南城市学院,湖南,益阳,413000

2.中南大学材料科学与工程学院,湖南,长沙,410083

3.中南大学材料科学与工程学院,湖南,长沙,410083;湖南城市学院,湖南,益阳,413000

4.中南大学材料科学与工程学院,湖南,长沙,410083

5.中南大学材料科学与工程学院,湖南,长沙,410083

基金项目: 浙江省湖州市自然科学基金(03JJY4051) 国家科技攻关项目(03AA741043)

关键词：镁合金 , 挤压 , 力学性能 , 热处理 , Mn , Sc

Effect of Mn and Sc on microstructures and mechanical properties of Mg-9Gd-4Y alloy

对MgGdYMn和MgGdYMnSc合金挤压成形,并对挤压合金热处理后的试样进行室温和高温拉伸实验.用金相显微镜(OM)、扫描(SEM)和透射电镜(TEM)等方法,研究添加Mn、Sc元素对该合金组织与力学性能的影响.结果表明:添加Mn元素能有效地提高Mg-9Gd-4Y合金形变细化晶粒的能力以及T6处理提高室温综合性能.添加Sc元素能提高合金的室温伸长率,但强度有所降低.添加Mn的合金在300℃拉伸时强度为200MPa,在400℃拉伸时显示出超塑性行为,而再添加Sc的合金在300℃拉伸时有超塑性表现.同时添加Mn和Sc的合金室温和高温强度下降.

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