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挤压变形对Mg-Zn-Zr合金组织与耐蚀性能的影响
Influence of Extrusion Deformation on Microstructure and Corrosion Resistance of Mg-Zn-Zr Alloy
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- DOI:
- 作者:
- 惠忠涛 闫明
HUI Zhongtao;YAN Ming
- 作者单位:
- 西安科技大学
Xi'an University of Science and Technology,Xi'an 710054,China
- 关键词:
- 正挤压 往复挤压 Mg-Zn-Zr合金 组织 耐蚀性能
forward extrusion reciprocating extrusion Mg-Zn-Zr alloy microstructure corrosion resistance
- 摘要:
- 对铸态Mg-Zn-Zr合金进行了往复挤压变形和正挤压变形处理,研究了3种状态下的Mg-Zn-Zr合金的显微组织、物相组成和耐腐蚀性能。结果表明,铸态Mg-Zn-Zr合金晶粒较为粗大,平均尺寸约在160μm,晶界处可见蠕虫状共晶组织的存在,晶内还可见粗大第二相颗粒;经过往复挤压和正挤压变形后,Mg-Zn-Zr合金发生了明显的动态再结晶,铸态下蠕虫状共晶组织以及枝晶消失,细小第二相质点在基体中均匀分布;往复挤压Mg-Zn-Zr合金的耐腐蚀性能最好,其次为正挤压Mg-Zn-Zr合金,二者均高于铸态Mg-Zn-Zr合金。Reciprocating extrusion and extrusion deformation were carried out on Mg-Zn-Zr alloy, the microstructure, phase composition and corrosion resistance of Mg-Zn-Zr alloy were studied. The results show that the grains of as-cast Mg-Zn-Zr alloy are coarse, the average size is about 160 μm, the vermicular eutectic structure can be seen at grain boundary, and coarse second phase particles can be seen in grain boundary. After reciprocating extrusion and forward extrusion deformation, dynamic recrystallization of Mg-Zn-Zr alloy is observed, fine second phase particles are uniformly distributed in the matrix. The corrosion resistance of Mg-Zn-Zr alloy by reciprocating extrusion is the best, followed by forward extrusion of Mg-Zn-Zr alloy, both of which are higher than that of as-cast Mg-Zn-Zr alloy.