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| 挤压比对Mg-Zn-Zr-RE 合金组织和性能的影响 |
| Effect of Extrusion Ratio on Microstructure and Mechanical Properties of Mg-Zn-Zr-RE Magnesium Alloy |
| Received:July 13, 2011 Revised:September 10, 2011 |
| DOI： |
| 中文关键词: 镁合金 微观组织 力学性能 |
| 英文关键词: magnesium alloy microstructure mechanical properties |
| 基金项目:国防基础科研重点项目（D1020060945） |
| Author Name | Affiliation | | ZHAO Zu-de | 1.No.59 Institute of China Ordnance Industry, Chongqing 400039, China
2.National Defence Research and Application Center of Precision Plastic Forming Technology, Chongqing 400039, China | | CHEN Qiang | 1.No.59 Institute of China Ordnance Industry, Chongqing 400039, China
2.National Defence Research and Application Center of Precision Plastic Forming Technology, Chongqing 400039, China | | SHU Da-yu | 1.No.59 Institute of China Ordnance Industry, Chongqing 400039, China
2.National Defence Research and Application Center of Precision Plastic Forming Technology, Chongqing 400039, China | | HU Chuan-kai | 1.No.59 Institute of China Ordnance Industry, Chongqing 400039, China
2.National Defence Research and Application Center of Precision Plastic Forming Technology, Chongqing 400039, China | | KANG Feng | 1.No.59 Institute of China Ordnance Industry, Chongqing 400039, China
2.National Defence Research and Application Center of Precision Plastic Forming Technology, Chongqing 400039, China | | HUANG Shu-hai | 1.No.59 Institute of China Ordnance Industry, Chongqing 400039, China
2.National Defence Research and Application Center of Precision Plastic Forming Technology, Chongqing 400039, China | | CHEN Man-li | 1.No.59 Institute of China Ordnance Industry, Chongqing 400039, China
2.National Defence Research and Application Center of Precision Plastic Forming Technology, Chongqing 400039, China |
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| 中文摘要: |
| 研究了不同挤压比对铸态Mg-5.4Zn-0.3Zr-0.98RE镁合金微观组织和力学性能的影响。研究表明，当挤压比较小时，微观组织呈现出粗晶和细晶组成的混晶组织；随着挤压比增加到16，微观组织发生完全再结晶，获得均匀、细小的再结晶组织。动态再结晶是铸态镁合金Mg-5.4Zn-0.3Zr-0.98RE晶粒细化的机制。在挤压温度为250 ℃，挤压比为16时，合金获得的力学性能最好，抗拉强度为345 MPa，屈服强度为223 MPa，断后伸长率为21.4％。 |
| 英文摘要: |
| Influences of extrusion ratios on microstructure and mechanical properties of as-cast Mg-5.4Zn-0.3Zr-0.98RE magnesium alloy were investigated. The results show that the microstructure is composed of coarse unrecrystallised grains and fine recrystallised grains when the extrusion ratio is low. When the extrusion ratio is increased to 16, complete recrystallisation occurs. Fine and homogeneous recrystallised grains are obtained. Dynamic recrystallisation is main mechanism of grain refinement for as-cast magnesium alloys. When the extrusion temperature is 250 ℃ and the extrusion ratio is 16, the best mechanical properties are obtained. The ultimate tensile strength, yield strength and elongation to fracture are 345 MPa, 223MPa and 21.4％. |
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