Microstructure and Mechanical Properties of an Extruded Mg-2Dy-0.5Zn Alloy

材料科学技术（英）, 2012, 28(6): 543-551.

Microstructure and Mechanical Properties of an Extruded Mg-2Dy-0.5Zn Alloy

^1, , ^2, , ^3, , ^4, , ^5, , ^6, , ^7,

1.Key Lab of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin Uni- versity, Nanling Campus, Changchun 130025, China

2.College of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China

3.Key Lab of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin Uni- versity, Nanling Campus, Changchun 130025, China

4.Key Lab of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin Uni- versity, Nanling Campus, Changchun 130025, China

5.Key Lab of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin Uni- versity, Nanling Campus, Changchun 130025, China

6.Key Lab of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin Uni- versity, Nanling Campus, Changchun 130025, China

7.Key Lab of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin Uni- versity, Nanling Campus, Changchun 130025, China

关键词：显微组织 , 力学性能 , 镁合金 , 极限拉伸强度 , 细晶强化 , 等温时效 , 衰老过程 , 老化时间

Microstructure and Mechanical Properties of an Extruded Mg-2Dy-0.5Zn Alloy

Cuangli Bi ^1, , Daqing Fang ^2, , Weichuan Zhang ^3, , Jothi Sudagar ^4, , Qingxin Zhang ^5, , JiansheLian ^6, , Zhonghao diang ^7,

1.Key Lab of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin Uni- versity, Nanling Campus, Changchun 130025, China

2.College of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China

3.Key Lab of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin Uni- versity, Nanling Campus, Changchun 130025, China

4.Key Lab of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin Uni- versity, Nanling Campus, Changchun 130025, China

5.Key Lab of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin Uni- versity, Nanling Campus, Changchun 130025, China

6.Key Lab of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin Uni- versity, Nanling Campus, Changchun 130025, China

7.Key Lab of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin Uni- versity, Nanling Campus, Changchun 130025, China

Keywords： Magnesium , Mg-Dy-Zn alloy , Microstructure , Mechanical properties , Long period stacking ordered phase ,

Microstructure and mechanical properties of an extruded Mg-2Dy-0.5Zn （at.%） alloy during isothermal ageing at 180℃ were investigated. Microstructure of the as-extruded alloy is mainly composed of α-Mg phase, 14H long period stacking order （LPSO） phase and small amounts of （Mg, Zn）=Dy particle phases. During ageing, the 14H LPSO phase forms and develops and its volume fraction increases with increasing ageing time. Tensile test showed that the peak-aged alloy exhibits similar yield and ultimate tensile strengths and elongation to failure at room temperature, 100℃ and 200℃, but excellent elevated temperature strengths at 300℃ as compared to the as-extruded and over-aged alloys. The analysis showed that the excellent elevated temperature strengths of the peak-aged alloy are attributed to the LPSO phase strengthening and the grain refinement strengthening, and the role of the LPSO strengthening is related to not only its amount, but also its morphology.

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材料期刊网

Microstructure and Mechanical Properties of an Extruded Mg-2Dy-0.5Zn Alloy

Microstructure and Mechanical Properties of an Extruded Mg-2Dy-0.5Zn Alloy

参考文献