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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials >Structural relaxation in Pd-Cu-Ni-P metallic glasses
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Structural relaxation in Pd-Cu-Ni-P metallic glasses

机译：Pd-Cu-Ni-P金属玻璃的结构弛豫

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摘要

The structural relaxation process in the Pd_(40)Cu_(30)Ni_(10)P_(20) and the Pd_(43)Cu_(27)Ni_(10)P_(20) metallic glasses was examined by measuring the electrical resistivity at room temperature, ρ(3 0 0), and the endothermic peak behavior peculiar to glass transition after relaxation on the differential scanning calorimetry (DSC) curve. It was concluded that the annihilation and the formation of the free volume increased and decreased the ρ(3 00), respectively. The maximum change in ρ(3 00) due to the annihilation of the free volume was about 2% of that in the as-quenched sample. The relaxation process at 540 K just below glass transition was investigated. The quenched-in free volume for a Pd_(43)Cu_(27)Ni_(10)P_(20) glass did not reach the equilibrium value within annealing period of about 3.0 x 10~6 s. The local structure of the Pd_(40)Cu_(30)Ni_9~(57)Fe_1 P_(20) glass was examined by Moessbauer spectroscopy for the relaxation process at 540 K. The average quadrupole splitting, Q, and the isomer shift, δ, decreased with time up to 1.44 x 10~6 s and thereafter these increased. The origin of this increase was not explained if we took account for the contribution of the chemical short range ordering process.
机译：Pd_（40）Cu_（30）Ni_（10）P_（20）和Pd_（43）Cu_（27）Ni_（10）P_（20）金属玻璃的结构弛豫过程通过测量室温ρ（3 0 0）和在差示扫描量热法（DSC）曲线上弛豫后玻璃化转变所特有的吸热峰行为。结论是the灭和自由体积的形成分别增加和减少了ρ（3 00）。由于自由体积的hil没，ρ（3 00）的最大变化约为淬火样品的2％。研究了刚好在玻璃化转变温度以下的540 K下的弛豫过程。 Pd_（43）Cu_（27）Ni_（10）P_（20）玻璃的淬火自由体积在约3.0 x 10〜6 s的退火时间内未达到平衡值。用Moessbauer光谱法研究了540 K时Pd_（40）Cu_（30）Ni_9〜（57）Fe_1 P_（20）玻璃的局部结构的弛豫过程。平均四极分裂Q和异构体位移δ随时间的延长而减小，直至1.44 x 10〜6 s，此后增加。如果考虑到化学短程订购过程的贡献，则无法解释这种增加的原因。

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