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研究了研究了Mg-30%Gd对Al-5Ti中间合金微观结构的影响,实验结果表明:Al-5Ti合金基体上存在大量均匀分布的条状的Al-Ti粒子,添加Mg-30%Gd后,合金中Ti-Al粒子形貌,尺寸及分布发生显著变化,当其添加量为1%时,合金中Ti Al3粒子的径向尺寸由20μm降低到5μm~10μm,继续增加添加量至2%时,合金基体上Ti-Al-粒子尺寸变化不大,合金基体上突现大量大尺寸的气孔;采用扫描电镜进行分析,发现Al-5Ti中间合金基体上无夹杂,粒子与Al基体的界面干净,能谱分析结果表明,粒子中Al∶Ti原子比接近3∶1.对比Al-5Ti和添加1%Mg-30%Gd后细化剂的细化效果,发现添加1%Mg-30%Gd后,加入Al-7Si合金后,细化效果显著提高。
The effects of Mg-30% Gd on the microstructure of Al-5Ti master alloy were studied. The experimental results show that there are a large number of uniformly distributed Al-Ti particles on the Al-5Ti alloy. After adding Mg-30% Gd , The morphology, size and distribution of Ti-Al particles in the alloy changed significantly. When the additive content was 1%, the radial size of TiAl3 particles in the alloy decreased from 20μm to 5μm ~ 10μm, and the amount of TiAl3 particles continued to increase to 2% , The size of the Ti-Al particles in the alloy matrix does not change much, and a large number of large-sized pores appear on the alloy matrix. The SEM analysis shows that there is no inclusions in the Al-5Ti master alloy and the interfaces between the particles and the Al matrix are clean, The results of energy spectrum analysis show that the atom ratio of Al:Ti in the particles is close to 3: 1.Comparing the refining effect of Al-5Ti with 1% Mg-30% Gd, it is found that after the addition of 1% Mg-30% Gd , Adding Al-7Si alloy, refining significantly improved.