Ce和C共同加入对Mg-6.0Al-2.0Si析出相和组织的影响

Effects of Ce and C on the Precipitated Phase and Structure of Mg-6.0Al-2.0Si

文章在实验基础上论述了在Mg-6.0Al-2.0Si合金中同时添加稀土元素Ce和C(质量比为9:1),对Mg-6.0Al-2.0Si合金析出相和组织的影响。通过XRD分析及SEM观察发现,Mg-6.0Al-2.0Si合金中共同加入Ce和C时,平均晶粒尺寸逐渐变小,到Ce和C共同加入质量分数为0.7%,晶粒平均尺寸为25μm,比未加Ce和C时56μm减少了55%.并使骨骼状β-Mg_(17)Al_(12)相变成弥散分布的颗粒状,稀土相为Al_3Ce、AlCe_3和Al_(92)Ce_8,以球状分布于β-Mg相基体中,或分布于晶界限制晶粒长大。加入的C与Al、Si形成Al_4Si_4C_7相为主,Al_4C_3相成为α-Mg形核核心,使Mg_2Si消失。

In this paper,the rare earth element Ce and C（mass ratio：9：1）were added to the Mg-6.0Al-2.0Si alloy to investigate the effect of their combined action on the precipitated phase and microstructure of Mg-6.0Al-2.0Si alloy. XRD analysis and SEM observation showed that the average grain size of Mg-6.0Al-2.0Si alloy became smaller,when the Ce and C addition was 0.7 wt.%,the average grain size of 25 μm,decreased by 55% than 56 μm without Ce and C. The bone shape β-Mg（17）Al（12） phase became granular and diffusive. Rare earth phase Al3Ce,AlCe3 and Al（92）Ce8 were distributed in α-Mg phase matrix or in the grain boundary to limit the grain growth. The added C with Al and Si in the Mg-6.0Al-2.0Si alloy formed Al4Si4C7 and Al4C3 phase as α-Mg core nucleus,and Mg2Si disappeared.