论文部分内容阅读
基于经典结晶理论讨论了非晶合金的晶化动力学因素和晶化热力学因素对玻璃形成能力(GFA)的影响.分析表明,合金的等温转变(TTT)曲线“鼻尖”温度Tn对应的黏度与晶化阻力因子成正比;重新加热时晶化开始温度Tx对应的黏度与晶化驱动力因子成反比.由此得到了新的GFA参数ω0=(Tg-T0)/(Tx-T0)-(Tg-T0)/(Tn-T0),其中Tg为玻璃转变温度,T0为理想玻璃转变温度.统计结果显示,ω0与临界冷却速率具有较高的相关性,R2高达0.9626.进一步分析表明:新提出的ω0参数可以合理地解释过冷熔体的黏度、脆性、液相稳定性、热稳定性以及Trg、ΔTx、γ、γm、ΔTrg、α、β、δ和φ等参数与GFA的关系.
The effects of crystallization kinetics and crystallization thermodynamics on the glass forming ability (GFA) of amorphous alloys were discussed based on the classical crystal theory. The results show that the isothermal transformation (TTT) curve of the alloy corresponds to the temperature Tn Viscosity and crystallization resistance factor is proportional to; reheating crystallization temperature Tx corresponds to the viscosity and crystallization driving force factor is inversely proportional to the resulting new GFA parameters ω0 = (Tg-T0) / (Tx-T0) - (Tg-T0) / (Tn-T0), where Tg is the glass transition temperature and T0 is the ideal glass transition temperature. The statistical results show that ω0 has a high correlation with the critical cooling rate and R2 is as high as 0.9626. The newly proposed ω0 parameter can reasonably explain the viscosity, brittleness, liquid phase stability, thermal stability and the effects of the parameters Trg, ΔTx, γ, γm, ΔTrg, α, β, relationship.