TiZr基非晶熔體與Ti合金的界面特征和熔體層結(jié)構(gòu)

TiZr基非晶熔體與Ti合金的界面特征和熔體層結(jié)構(gòu)Interfacial characteristics and microstructure of molten layer of TiZr-based metallic glass melt and Ti-based alloy

為研究TiZr基非晶熔體與Ti基合金之間的兩相交互作用，明確非晶復(fù)合材料中兩相平衡的控制因素及調(diào)控規(guī)律，利用改進(jìn)的液橋方法，設(shè)計(jì)5組不同保溫溫度的液橋?qū)嶒?yàn)，其中保溫溫度分別為700、750、800、850和900 ℃，通過此實(shí)驗(yàn)研究溫度對兩相界面特征及熔體層結(jié)構(gòu)的影響。結(jié)果表明：界面處的基片發(fā)生溶解，且溶解深度隨著溫度的升高而增大，受重力影響，上基片溶解量略低于下基片的；兩相之間具有良好的成分穩(wěn)定性，溶解進(jìn)入合金熔體的Ti基合金保持成分基本不變以枝晶的形態(tài)析出。隨基片溶解量增大，熔體中析出的枝晶相的體積分?jǐn)?shù)增加，且枝晶相含量隨著離界面距離的增加逐漸減小。

In order to study the interaction between TiZr-based metallic glass melt and Ti-based alloy, and confirm the factors that control the two-phase equilibrium in bulk metallic glass composite, the effects of temperature on the interfacial characteristics and the microstructure of molten layer were studied at 700, 750, 800, 850 and 900 ℃, respectively, by using the modified liquid-bridge method. The interfacial characteristic was studied by scanning electron microscopy (SEM) and the microstructure of molten layer was analyzed by X-ray diffractometry (XRD). The results show that the substrate dissolves and its dissolution depth increases in accordance with temperature increasing. As the effect of convection, the dissolution depth of the lower substrate is higher than that of the upper one. TiZr-based metallic glass and Ti-based alloy show good componential stability. The Ti-based alloy which dissolves into the TiZr-based metallic glass melt can maintain its chemical components and precipitates in dendrite morphology. Besides, the volume fraction of dendrites in the molten layer increases with temperature and declines with increasing the distance from the interface.

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