Effect of Microstructural Change on High-Temperature Deformation in Pre-Annealed Zr<SUB>65</SUB>Al<SUB>10</SUB>Ni<SUB>10</SUB>Cu<SUB>15</SUB> Bulk Metallic Glass

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  • Kobata Junpei
    Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University
  • Tsuda Hiroshi
    Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University
  • Takigawa Yorinobu
    Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University
  • Higashi Kenji
    Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University

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  • Effect of Microstructural Change on High-Temperature Deformation in Pre-Annealed Zr65Al10Ni10Cu15 Bulk Metallic Glass

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Abstract

The effect of the microstructural change on the high-temperature tensile deformation behavior in the supercooled liquid region is investigated in the pre-annealed Zr65Al10Ni10Cu15 bulk metallic glass. The microstructure before the tensile test on the specimen annealed at 673 K for 1.8 ks shows that a small amount of icosahedral phase precipitates and a large amount of amorphous phase still remains. On the contrary, the specimen annealed at 673 K for 2.7 ks shows that a large amount of icosahedral phase precipitates and the presence of amorphous phase is hardly noticeable. From the fact that flow stress of the specimen annealed at 673 K for 2.7 ks increases in comparison with that of as-received specimen as well as the specimen annealed at 673 K for 1.8 ks in the tensile test, it seems that the deformation behavior in the tension tests is greatly influenced by the difference in the degree of the precipitation of icosahedral phase. Since the m value is about 0.5 and many grain boundaries of icosahedral phase are formed in the specimen annealed at 673 K for 2.7 ks, the interaction between the icosahedral phase particles must be the cause of increase in initial stress. Accordingly, the microstructure of the gage section after tensile test in the specimen annealed at 673 K for 1.8 ks shows that the large amount of icosahedaral phase precipitates in the amorphous matrix. The strain hardening must be caused by the interaction between the icosahedral phase particles whose precipitation and growth are enhanced by deformation.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 46 (12), 2864-2869, 2005

    The Japan Institute of Metals and Materials

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