Enhanced Strength and Corrosion Resistance of Mg–2Zn–0.6Zr Alloy with Extrusion
Enhanced Strength and Corrosion Resistance of Mg–2Zn–0.6Zr Alloy with Extrusion
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DOI：
10.1007/s40195-018-0793-6
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发表时间：
2018-08
期刊：
影响因子：
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通讯作者：
Luan-Xiang Wang;Ren-Bo Song;Chang-Hong Cai;Jing-Yuan Li
中科院分区：
文献类型：
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作者：
Luan-Xiang Wang;Ren-Bo Song;Chang-Hong Cai;Jing-Yuan Li
研究了Mg-2 Zn-0. 6 Zr合金铸态和挤压态的显微组织、力学性能和腐蚀行为。显微组织分析表明，挤压显著细化了晶粒，并显著降低了析出相的体积分数和尺寸。与铸态合金相比，挤压态合金具有更好的力学性能，特别是屈服强度从51 MPa提高到194 MPa。细化晶粒、弥散析出相和织构是影响强度提高的主要因素。电化学测试和浸泡试验表明，挤压后Mg-2 Zn-0.6Zr合金的腐蚀速率由挤压前的1.68 mm/年降低到0.32 mm/年。结果表明，合金的耐蚀性提高主要是由于合金中析出相的体积分数和电位降低，晶粒细化，形成了更多的保护性腐蚀膜。
The microstructure, mechanical properties and corrosion behavior of Mg–2Zn–0.6Zr alloy under the as-cast and as-extruded conditions were investigated. Microstructure analysis indicated the remarkable grain refinement by extrusion, as well as notable reductions in volume fraction and size of precipitate phases. As compared with the as-cast alloy, the as-extruded alloy exhibited better mechanical performance, especially in yield strength which was promoted from 51 to 194 MPa. Refined grains, dispersive precipitate phases and texture were thought to be the main factors affecting the improved performance in strength. The electrochemical measurement and immersion test revealed the corrosion rate of Mg–2Zn–0.6Zr alloy by extrusion decreased from 1.68 to 0.32 mm/year. The reasons for the enhanced corrosion resistance were mainly attributed to the decreased volume fraction and Volta potential of the precipitate phases, the refinement of the grain size, as well as the formation of more protective corrosion film.