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Structural stability of Pd_(40)Cu_(30)Ni_(10)P_(20) metallic glass in supercooled liquid region

机译:过冷液体区Pd_(40)Cu_(30)Ni_(10)P_(20)金属玻璃的结构稳定性

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摘要

Phase separation of bulk and ribbon Pd_(40)Cu_(30)Ni_(10)P_(20) glasses, annealed in the supercooled liquid region at ambient pressure and high pressures, has been studied by means of differential scanning calorimetry (DSC) and X-ray diffraction techniques. DSC measurements show only one glass transition event in all annealed samples, indicating that no phase separation occurs in the alloy annealed in the supercooled liquid region. Phase analyses reveal at least six crystalline phases in the crystallized sample: monoclinic, tetragonal Cu_3Pd-like, rhombohedral, fcc-Ni_2Pd_2P, fcc-(Ni, Pd) solid solution, and body-centered tetragonal (bct) Ni_3P-like phases. Annealing treatments under external pressures in the vicinity of the glass transition temperature neither induce phase separation nor alter the glass transition temperature of the Pd_(30)Cu_(30)Ni_(10)P_(20)bulk glass.
机译:已通过差示扫描量热法(DSC)研究了在环境压力和高压下在过冷液体区域中退火的块状和带状Pd_(40)Cu_(30)Ni_(10)P_(20)玻璃的相分离X射线衍射技术。 DSC测量显示在所有退火样品中只有一个玻璃化转变事件,表明在过冷液体区域中退火的合金中没有发生相分离。相分析揭示了结晶样品中至少有六个晶相:单斜晶,四方Cu_3Pd样,菱形,fcc-Ni_2Pd_2P,fcc-(Ni,Pd)固溶体和体心四方(bct)Ni_3P样相。在玻璃化转变温度附近的外部压力下进行的退火处理既不会引起相分离,也不会改变Pd_(30)Cu_(30)Ni_(10)P_(20)大块玻璃的玻璃化转变温度。

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