论文标题
高压对Ni $ _ {62} $ nb $ _ {38} $合金的相变的异常影响
Unusual effect of high pressures on phase transformations in Ni$_{62}$Nb$_{38}$ alloy
论文作者
论文摘要
二进制ni $ _ {62} $ nb $ _ {38} $合金属于唯一的二进制外偏外系统，它们能够形成一个散装的玻璃状态[L. Xia等人，J。Appl。物理。 99（2006）026103]。在目前的工作中，（$ p $，$ t $）ni $ _ {62} $ nb $ _ {38} $合金的（62} $ nb $ _ {62} $ nb $ _ {38} $首先确定，其温度从$ 300 $ \，k，k $ 6000 $ \，k至$ $ \ $ \ $ \ $ \ $ 1 $ \，atm at Atm at Atm tos at Atm tos at Atm tos at Atm tos 1 $ 1.2 $ 1.2 $ 1.2 $ 1.2 $ 1.2^7 $ \。对于此热力学范围，定义了相图（例如液晶共存线和玻璃过渡线）的相位元素。我们的结果揭示了仿真结果与液体温度的已知实验值与Isobar $ p = 1 $ \，ATM的玻璃过渡温度之间的良好一致性。详细说明了相位图的压力大于$ 1 \ times10^{7} $ \，atm。首次确定了系统中液体NB和晶体NI相的相分离条件。
Binary Ni$_{62}$Nb$_{38}$ alloy belongs to the unique class of binary off-eutectic systems, which are able to form a bulk glassy state [L. Xia et al., J. Appl. Phys. 99 (2006) 026103]. In the present work, the ($p$, $T$) phase diagram of Ni$_{62}$Nb$_{38}$ alloy was first determined for a wide thermodynamic range with temperatures from $300$\,K to $6000$\,K and with pressures from $1$\,atm to $1.2\times10^7$\,atm. For this thermodynamic range, elements of the phase diagram such as the liquid-crystal coexistence line and the glass transition line are defined. Our results reveal good agreement between the simulation results and the known experimental values of the liquidus temperature and the glass transition temperature for the isobar $p=1$\,atm. The phase diagram is detailed for pressures greater than $1\times10^{7}$\,atm. For the first time, the phase separation conditions at which the liquid Nb and crystalline Ni phases coexist in the system were determined.
