(中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083)
摘 要: 研究了微量Mn、 Zr對Mg-13％Gd和Mg-9％Gd-4%Y合金鑄態(tài)和擠壓后的微觀組織及力學(xué)性能的影響。 結(jié)果表明： 在鑄態(tài)， 含Zr合金的晶粒明顯小于不含Zr的合金， 而Mn對合金的鑄態(tài)顯微組織影響不大； 將Mg-9％Gd-4%Y-0.6％Mn和Mg-9％Gd-4%Y-0.6％Zr合金擠壓后，都可以得到非常細(xì)小均勻的等軸晶， 晶粒尺寸約14 μm； 這兩個合金在擠壓時效態(tài)（T5）的力學(xué)性能都明顯優(yōu)于WE54合金的， 且Mg-9％Gd-4%Y-0.6％Zr合金比Mg-9％Gd-4%Y-0.6％Mn合金性能更好。
關(guān)鍵字: Mg-Gd-Y-Zr-(Mn)合金； 顯微組織； 晶粒細(xì)化； 力學(xué)性能
properties of Mg-Gd-Y alloys
JIANG Hao, DENG Zhen-zhen
（ School of Materials Science and Engineering，
Central South University, Changsha 410083, China）
Abstract: The effect of small amount of Mn and Zr on the microstructure and mechanical properties of Mg-13%Gd and Mg-9%Gd-4%Y alloys was studied. The results show that the grains of the Zr-containing alloys are much finer than those of the Zr free alloys in as-cast, and Mn has little effect on the as-cast microstructure. After Mg-9％Gd-4%Y-0.6％Mn alloy and Mg-9％Gd-4%Y-0.6％Zr alloy are extruded, the very fine particle about 14 μm and uniform grains are obtained. The mechanical properties of the two alloys at the extruded-T5 state are all better than those of the WE54 alloy, and the properties of the Mg-9％Gd-4%Y-0.6％Zr alloy are superior to those of the Mg-9％Gd-4%Y-0.6％Mn alloy.
Key words: Mg-Gd-Y-Zr-(Mn) alloy; microstructure; grain refinement; mechanical properties
