Rapidly solidified powder metallurgy Mg97Zn1Y2Alloys with excellent tensile yield strength above 600 MPa
Rapidly solidified powder metallurgy Mg97Zn1Y2Alloys with excellent tensile yield strength above 600 MPa
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DOI：
10.2320/matertrans.42.1172
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发表时间：
2001-07-01
影响因子：
1.2
通讯作者：
Masumoto, T
中科院分区：
文献类型：
--
作者：
Kawamura, Y;Hayashi, K;Masumoto, T
采用快速凝固粉末冶金(RS P/M)工艺制备了具有高抗拉强度、高高温抗拉强度、高应变速率超塑性和高热稳定性的纳米晶镁合金。与固结温度有关的拉伸屈服强度和延伸率分别在480~610 Mpa和5~16%之间。RS粉末冶金合金的杨氏模数为45 Gpa。AZ91-T6合金的比拉伸屈服强度是工业AZ91-T6合金的4倍，高于常规钛合金(Ti-6Al-4V)和铝合金(7075-T6)。RS粉末冶金合金在423K下表现出良好的高温屈服强度(510 Mpa)，在1×10(-2)~1×10(0)S(-1)的宽应变速率范围内和623K的低温下表现出高应变率超塑性，可望在某些对室温和高温比强度和加工性能要求较高的领域应用。
Nanocrystalline magnesium alloys having high tensile strength, high elevated-temperature tensile strength, high-strain-rate superplasticity and high thermal stability have been developed in Mg97Zn1Y2 (at%) alloy by rapidly solidified powder metallurgy (RS P/M) processing. The tensile yield strength and elongation that were dependent on the consolidation temperature were in the ranges of 480 to 610MPa and 5 to 16%., respectively. Young's modulus of the RS P/M alloy was 45 GPa. The specific tensile yield strength was four times as high as, that of a commercial AZ91-T6 alloy, and was higher than those of conventional titanium (Ti-6Al-4V) and aluminum (7075-T6) alloys. The RS P/M alloys exhibited excellent elevated-temperature yield strength that was 510 MPa at 423 K. The RS P/M alloy also exhibited high-strain-rate superplasticity at a wide strain-rate range from 1 x 10(-2) to 1 x 10(0) s(-1) and at a low temperature of 623 K. It is expected that the Mg97Zn1Y2 RS P/M alloy can be applied in some fields that requires simultaneously the high specific strength at ambient and elevated temperatures and high workability.