稀土Y对AZ31镁合金金相组织和力学性能的影响

Effects of Y on Microstructure and Mechanical Properties of AZ31 Magnesium Alloy

研究了稀土元素Y对AZ31镁合金金相组织和力学性能的影响。结果表明：当稀土添加量为0．6％～0．9％时，仅（Mg）基体晶粒变细，并且加入量为0．9％时得到更细化的组织，13相（Mg17Al12）在晶界由连续网状变为断续弥散状分布，由于α（Mg）基体晶粒的细化和p柏形貌的改善，合金的力学性能有提高；当稀土添加量为1．2％时，α（Mg）基体晶粒显著粗化，β相（Mg17Al12）内部出现针状和圆盘状的第二相，力学性能下降。

The effects of yttrium on the microstructure and mechanical properties of AZ31 magnesium alloy were studied in this paper. The experimental results show that α （Mg） matrix is refined when the yttrium addition is 0.6 % -0.9 % and the alloy with 0.9 % yttrium addition can obtain a finer microstructure. The net likeβ phase exit in the grain boundries become discontinual and dissemination. As a result of crystal grain refinement of α（Mg） matrix and the appearance improvement of β phase. The alloy＇ s mechanical properties are improved. When the yttrium addition is 1.2% , the crystal grain of α（Mg） matrix remarkable eoarsed, a great deal of pin like or plate like second phase appear interior the β phase and the mechanical properties decreased.