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以Al-10Ti中间合金的形式将Ti元素加入到Super Dyma镀锌合金中,制备了Ti含量分别为0.1%,0.3%和0.5%(质量分数)的Super Dyma镀锌合金金相样品,采用扫描电子显微镜(SEM)研究了Ti元素添加量对Super Dyma镀锌合金凝固组织的影响,利用能谱仪(EDS)分析了Ti元素在这些镀锌合金组织中的分布规律,使用X射线衍射(XRD)分析了不同Ti含量的Super Dyma镀锌合金中的相组成,采用差热分析法(DTA)测定了不同Ti含量的Super Dyma镀锌合金中富铝相的开始凝固温度。实验结果表明,Super Dyma镀锌合金凝固组织由富Al相、富Zn相、MgZn_2相以及Zn/Al/MgZn_2三元共晶组织组成,Ti元素的加入使Super Dyma镀锌合金的起始凝固温度降低,使Super Dyma镀锌合金凝固组织中的富铝枝晶明显变细,MgZn_2相的尺寸大幅减小,并使Zn/Al/MgZn_2三元共晶组织得到细化。
In the form of Al-10Ti master alloy, Ti element was added into Super Dyma galvanized alloy to prepare the samples of Super Dyma galvanized alloy with Ti contents of 0.1%, 0.3% and 0.5%, respectively. The effects of Ti addition on the solidification microstructure of Super Dyma galvanized alloy were studied by means of electron microscope (SEM). The distribution of Ti in these galvanized alloys was analyzed by energy dispersive spectrometer (EDS). XRD ), The phase composition of Super Dyma galvanized alloys with different Ti content was analyzed. The onset solidification temperature of Al-rich phase in Super Dyma galvanized alloys with different Ti content was determined by DTA. The experimental results show that the solidification microstructure of Super Dyma galvanized alloy consists of Al rich phase, Zn rich phase, MgZn 2 phase and Zn / Al / MgZn 2 ternary eutectic microstructure. The addition of Ti element makes the initial solidification temperature of Super Dyma galvanized alloy Decreased, the Al-rich dendrite in the solidified structure of Super Dyma galvanized alloy was obviously thinned, the size of MgZn_2 phase was greatly reduced, and the ternary eutectic Zn / Al / MgZn 2 structure was refined.