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在大块非晶临界冷却速率的非等温转变计算模型基础上提出了基于成分连续变化计算黏度的合金系临界冷速模型.依据此模型对Zr_Ni_Al_Cu四元合金的临界冷却速率进行了计算并预测了Zr66.67(NixAlyCuz)33.33合金系中容易形成非晶的成分范围.计算值与实验值符合得较好.计算结果表明,此合金系具有很强的非晶形成能力,特别是在靠近共晶点的中心区域,临界冷却速率小于100K/s,为容易形成非晶的成分范围.冷却过程中,在高于1000K温度区间,没有发生明显的结晶现象,而在980K至870K温度范围内,结晶分数快速增大,低于870K时不再发生明显改变.此外,分析了合金系中Al,Cu,Ni原子摩尔分数的变化对临界冷速的影响.
Based on the non-isothermal transformation calculation model of bulk amorphous critical cooling rate, a critical cooling rate model of alloy system based on continuous variation of composition was proposed. Based on this model, the critical cooling rate of Zr_Ni_Al_Cu quaternary alloy was calculated and predicted Zr66.67 (NixAlyCuz) 33.33 alloy system is easy to form the amorphous composition range.The calculated value is in good agreement with the experimental data.The calculated results show that this alloy system has a strong amorphous formation ability, especially in the vicinity of eutectic In the central region of the spot, the critical cooling rate is less than 100 K / s, which is the composition range for the easy formation of the amorphous phase. In the cooling process, no obvious crystallization occurs in the temperature range above 1000 K, whereas in the 980 K to 870 K temperature range The fraction increases rapidly and no significant changes occur below 870 K. In addition, the influence of the mole fraction of Al, Cu and Ni atoms on the critical cooling rate in the alloy system is analyzed.