Effect of Pouring Temperature on Microstructure and Properties of New Vanadium Microalloyed Casting Magnesium Alloy
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摘要: 采用不同的浇注温度对汽车零部件用新型含钒铸造镁合金Mg-9Al-1Zn-0.6V试样进行了铸造成型,并对制备的铸造镁合金显微组织、拉伸性能和耐腐蚀性能进行了测试和分析。结果表明:随浇注温度从680℃升高到730℃,钒微合金化合金试样的抗拉强度先增大后减小,腐蚀电位于正移后负移,组织、拉伸性能和耐腐蚀得到改善。与680℃浇注温度铸造时相比,710℃浇注温度下试样的抗拉、屈服强度均增大了18 MPa,腐蚀电位正移了85 mV,断后伸长率仅减小了1%。钒微合金化镁合金Mg-9Al-1Zn-0.6V的浇注温度优选为:710℃。Abstract: The casting experiments for the new magnesium alloy Mg-9 Al-1 Zn-0.6 V used for automotive parts were carried out at different pouring temperatures.The microstructure,tensile properties and corrosion resistance of the obtained magnesium alloy were tested and analyzed.The results show that with the pouring temperature increasing from 680 ℃ to 730 ℃,the tensile strength of the magnesium alloy increases first and then decreases,and the corrosion potential of the alloy presents a positive shift first and then negative displacement,companying improvement in microstructure,tensible properties and corrosion resistance of the samples.Compared with those of the sample obtained at pouring temperature of 680 ℃,both the tensile strength and yield strength of the sample at 710 ℃ increase by 18 MPa,and the corrosion potential positively shifts by 85 mV while the elongation after fracture decreases by 1% for the sample at 710 ℃.The optimum pouring temperature of the novel magnesium alloy Mg-9 Al-1 Zn-0.6 V is determined at 710 ℃.
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