Deformation-induced structural transformation leading to compressive plasticity in Zr_65Al_7.5Ni_10Cu_12.5M_5 (M = Nb, Pd) glassy alloys
Deformation-induced structural transformation leading to compressive plasticity in Zr_65Al_7.5Ni_10Cu_12.5M_5 (M = Nb, Pd) glassy alloys
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DOI：
10.1557/jmr.2010.0153
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发表时间：
2010-06
影响因子：
2.7
通讯作者：
A. Setyawan;J. Saida;H. Kato;M. Matsushita;A. Inoue
中科院分区：
文献类型：
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作者：
A. Setyawan;J. Saida;H. Kato;M. Matsushita;A. Inoue
Zr_65Al_7.5Ni_10Cu_12.5Nb_5玻璃表现出超过10%的大塑性压缩应变，这是由于形变诱导的纳米晶化。然而，透射电子显微镜观察，只揭示了模糊的有序团簇的大小为102 nm的变形样品的断裂表面，而不是良好的识别晶体，如先前报道的Zr-Al-Ni-Cu-Pd系统。这种现象与Zr_（65）Al_（7.5）Ni_（10）Cu_（12.5）Pd_（5）合金中过冷液相的粘度较高和二十面体相的晶粒长大较慢有关。讨论了形变诱导纳米团簇对提高压缩塑性的作用。
Zr_65Al_7.5Ni_10Cu_12.5Nb_5 glass was found to exhibit a large plastic compressive strain of over 10% and the property was suggested to be due to deformation-induced nanocrystallization. A transmission electron microscopic observation, however, only revealed obscure ordered clusters with a size of ˜2 nm in the fracture surface of a deformed sample, instead of well-identified crystals as previously reported for the Zr–Al–Ni–Cu–Pd system. This phenomenon is suggested to correlate with the higher viscosity of supercooled liquid and the slower grain growth of icosahedral phase during primary crystallization in the Zr_65Al_7.5Ni_10Cu_12.5Nb_5 compared to those in the Zr_65Al_7.5Ni_10Cu_12.5Pd_5 alloy. The role of the deformation-induced nanoclusters on the enhanced compressive plasticity was discussed.