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试验采用几种方式对ZL102合金中加入富镧混合稀土变质处理后的合金组织进行观察。结果表明:富镧混合稀土对ZL102合金有比较好的变质作用,随着稀土量的增加,共晶硅相逐渐变细,呈篆字形,它与未变质和钠盐变质产生的共晶硅相形态有明显区别。随着稀土量进一步增加,共晶硅相保持不变,合金中又产生新相,并逐渐增加,在合金抗拉强度及延伸率上反映出类似的规律。实验方法和结果试验是在750℃～760℃下将铝-富镧混合稀土中间合金(含稀±15％)加入熔融的ZL102合金液中进行变质处理,静置15分钟后浇注φ12mm金属型金相试样。对试样分别作金相观察、深腐蚀(浸蚀剂为25％HCl)或全腐蚀处理后扫描电镜观察。
Several ways were used to test the alloy microstructure after adding lanthanum-rich mixed rare earth into ZL102 alloy. The results show that the lanthanum-rich mixed rare earth has good metamorphism on ZL102 alloy. With the increase of rare earth content, the eutectic silicon phase becomes thinner and has a seal character, which is consistent with the eutectic silicon phase Form a clear difference. With the further increase of the amount of rare earth, the eutectic silicon phase remains unchanged, and a new phase is produced in the alloy and gradually increases, showing a similar rule in the tensile strength and elongation of the alloy. Experimental methods and results of the experiment is the aluminum-rich lanthanum mixed rare earth master alloy (containing dilute ± 15%) was added to the melted ZL102 alloy solution at 750 ℃ ~ 760 ℃ for modification, after standing for 15 minutes pouring φ12mm metal gold Phase sample. Metallographic observation of the samples were made, deep etching (etchant 25% HCl) or scanning electron microscope observation after all corrosion treatment.