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《Journal of Southeast University(Natural Science Edition)》 2008-03
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Microstructures and mechanical properties of extruded Mg-4Nd and Mg-4Nd-0.7Zr alloys

Wang Xiaofang1 Sun Yangshan1 Shen Chao1 Xue Feng1 Tao Weijian2(1 School of Materials Science and Engineering,Southeast University,Nanjing 211189,China)(2Nanjing Welbow Metals Co.,Ltd.,Nanjing 211221,China)  
Two alloys,Mg-4Nd and Mg-4Nd-0.7Zr,have been prepared in a mild steel crucible.The microstructures and mechanical properties of these two alloys are investigated.The as-cast microstructure of Mg-4Nd alloy consists of α-Mg matrix and an intermetallic compound Mg12Nd.Small amount of Zr addition greatly refines the as-cast microstructure,and results in consecutive distribution of Mg12Nd along grain boundaries.Hot extrusion causes significant improvement of tensile properties of both alloys.Zr addition to the binary Mg-4Nd alloy raises the recrystallization temperature of the alloy and inhibits the growth of the matrix grains.Therefore,the strengths of extruded and aged specimens of the Mg-4Nd-0.7Zr alloy are notably higher than that without Zr addition.Direct aging(T5 treatment)of extruded samples at 225℃ leads to remarkable improvement of tensile properties due to the combined effect of work hardening and age hardening.Transmission electron microscopy(TEM)observations reveal two kinds of precipitates,β' and β,from the aged sample.The size of both precipitates are in the range of 10 to 100nm.The precipitates exhibit significant effect of age hardening on the alloy.
【Fund】: 江苏省自然科学基金预研资助项目(BK2004208)
【CateGory Index】: TG113
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