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Effects of Zn Interlayer on Microstructures and Mechanical Properties of TC4/AZ91D Bimetal via Solid–Liquid Compound Casting Process
International Journal of Metalcasting ( IF 2.6 ) Pub Date : 2021-05-20 , DOI: 10.1007/s40962-021-00612-9
Jingjing Shangguan , Jianhua Zhao , Yu Shi , Cheng Gu , Bingyan Jin , Jin Cheng , Yu Guo

The solid–liquid compound casting (SLCC) was used to produce Ti/Mg bimetal via hot dip Zn coating, and the interfacial microstructures and mechanical properties of the Mg/Ti bimetal were investigated in this work. The scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) reveal that there is no interlayer metallurgical reaction when the pouring temperature is 670 °C. As the pouring temperature increases to 710 and 750 °C, the thickness of the metallurgical interfacial zone is about 130 and 310 µm, respectively. The interfacial zone is mainly consists of α-Mg and τ-TiAlZn coexistence phases. Thermodynamic models are established to explain the evolution mechanism of α-Mg and τ-TiAlZn coexistence phases. It is concluded that the formation process of α-Mg and τ-TiAlZn phase coexist is as follows: TiZn5(s)-to-TiZn5(l), and then α-Mg and τ-TiAlZn phases coexist. While the sequence of the phases that formed in the Ti–Al–Zn ternary system is TiAl3τ-TiAlZn, this is based on the fact that the Al atoms are used up at the interfacial zone. The highest shear strength of Zn-coated TC4/AZ91D bimetallic material is up to 34.24 Mpa when the pouring temperature is 710 °C.



中文翻译:

固液复合铸造工艺对Zn中间层对TC4 / AZ91D双金属组织和力学性能的影响

固液复合铸造(SLCC)被用于通过热浸锌涂层生产Ti / Mg双金属,并且在这项工作中研究了Mg / Ti双金属的界面组织和力学性能。扫描电子显微镜(SEM)和能量色散光谱(EDS)表明,当浇铸温度为670°C时,没有层间冶金反应。随着浇铸温度增加到710和750°C,冶金界面区的厚度分别约为130和310 µm。界面区域主要由α- Mg和τ- TiAlZn共存相组成。建立热力学模型来解释α- Mg和τ的演化机理-TiAlZn共存相。结论:α -Mg和τ- TiAlZn相共存的形成过程如下:TiZn 5(s)-TiZn 5(l),然后α -Mg和τ- TiAlZn相共存。虽然在Ti–Al–Zn三元体系中形成的相序是TiAl 3τ- TiAlZn,但这是基于Al原子在界面区域被耗尽的事实。当浇铸温度为710°C时,镀锌的TC4 / AZ91D双金属材料的最高剪切强度高达34.24 Mpa。

更新日期:2021-05-22
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