电处理对Ti基非晶合金变温晶化行为的影响

    Influence of electrical treatment on temperature dependent crystallization behavior of Ti-based metallic glass

    • 摘要: 非晶合金因其独特结构和优异的力学性能展现出广泛的应用潜力。电处理能够诱使非晶合金结构改变进而影响其力学性能和热稳定性。采用铜模铸造法制备了Ti37Zr9.3Cu46.3Sn2.4Ni5非晶合金,利用差示扫描量热法研究了合金的变温晶化行为,分析了电处理对非晶合金晶化动力学的影响。研究表明Ti37Zr9.3Cu46.3Sn2.4Ni5非晶合金经过电处理后,各特征温度升高,铸态合金的过冷液相区为33.3 K,电处理后数值增加了15.4 K。基于Kissinger法计算了电处理前后非晶合金的表观激活能,铸态合金的晶化起始激活能Ex为203.1 kJ/mol、晶化峰值激活能Ep为187.2 kJ/mol,电处理后激活能数值显著增大。采用Doyle方法计算了电处理前后非晶合金的局域激活能,数值随晶化体积分数增大逐渐降低。相同晶化体积分数下,电处理后合金的局域激活能明显高于铸态合金。Ti37Zr9.3Cu46.3Sn2.4Ni5非晶合金经电处理后热稳定性得到改善。

       

      Abstract: Metallic glass (MG) has shown wide application potential due to their unique structure and excellent mechanical properties. Electrical treatment can induce structural changes in MG, thereby affecting their mechanical properties and thermal stability. In this work, Ti37Zr9.3Cu46.3Sn2.4Ni5 MG was prepared by copper mold casting method. The temperature dependent crystallization behavior of the alloy during continuous heating was studied using differential scanning calorimetry, and the effect of electrical treatment on the crystallization kinetics was analyzed. After electrical treatment, the characteristic temperatures of Ti37Zr9.3Cu46.3Sn2.4Ni5 MG significantly increased. The supercooled liquid phase region of the as-cast alloy is 33.3 K, while the value increased by 15.4 K after electrical treatment. The apparent activation energy of MG before and after electrical treatment was calculated based on the Kissinger method. The crystallization initiation activation energy Ex of the as-cast alloy is 203.1 kJ/mol, and the crystallization peak activation energy Ep is 187.2 kJ/mol. The activation energy values significantly increase after electrical treatment. The Doyle method was used to calculate the local activation energy of MG before and after electrical treatment, and the local activation energy gradually decreases with the increase of crystallization volume fraction during the crystallization process. Under the same crystallization volume fraction, the localized activation energy of the alloy after electrical treatment is significantly higher than that of the as cast alloy. The thermal stability of Ti37Zr9.3Cu46.3Sn2.4Ni5 MG has been improved induced by electrical treatment.

       

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