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Study on Grain Refinement Mechanisms and Mechanical Properties of bi-Modal Ti-55511 Titanium Alloy during Hot Rolling.

ABSTRACT: Multi-pass hot rolling was performed on bi-modal Ti-55511 alloy with 50% rolling reduction at 700 °C. Mechanical properties were evaluated by tensile test, and microstructure evolution was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the Ti-55511 alloy with bi-modal microstructure exhibits good strength and high ductility (1102 MPa, 21.7%). Comparatively, after 50% hot rolling, an enhanced strength and decreased ductility were obtained. The refinement of ? phases leads to the increased tensile strength, while the fragmentation of the equiaxed ? phase results in a decreased ductility. The fragmentation process of equiaxed ? phases followed the sequence of: elongation of ? phases ? formation of grooves and localized shear bands ? the final fragmentation accomplished via deepening grooves.

SUBMITTER: Chen W

PROVIDER: S-EPMC7435951 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature

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Study on Grain Refinement Mechanisms and Mechanical Properties of bi-Modal Ti-55511 Titanium Alloy during Hot Rolling.

Chen Wei W Zhang Xiaoyong X Lin YongChecg Y Zhou Kechao K

Materials (Basel, Switzerland) 20200728 15

Multi-pass hot rolling was performed on bi-modal Ti-55511 alloy with 50% rolling reduction at 700 °C. Mechanical properties were evaluated by tensile test, and microstructure evolution was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the Ti-55511 alloy with bi-modal microstructure exhibits good strength and high ductility (1102 MPa, 21.7%). Comparatively, after 50% hot rolling, an enhanced strength and decreased ductility w ...[more]

PMID: 32731500

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