Scaling up of High-Pressure Sliding (HPS) for Grain Refinement and Superplasticity

Yoichi Takizawa, Takahiro Masuda, Kazushige Fujimitsu, Takahiro Kajita, Kyohei Watanabe, Manabu Yumoto, Yoshiharu Otagiri, Zenji Horita

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    22 Citations (Scopus)

    Abstract

    The process of high-pressure sliding (HPS) is a method of severe plastic deformation developed recently for grain refinement of metallic materials under high pressure. The sample for HPS is used with a form of sheet or rod. In this study, an HPS facility with capacities of 500 tonnes for vertical pressing and of 500 and 300 tonnes for horizontal forward and backward pressings, respectively, was newly built and applied for grain refinement of a Mg alloy as AZ61, Al alloys such as Al-Mg-Sc, A2024 and A7075 alloys, a Ti alloy as ASTM-F1295, and a Ni-based superalloy as Inconel 718. Sheet samples with dimensions of 10 to 30 mm width, 100 mm length, and 1 mm thickness were processed at room temperature and ultrafine grains with sizes of ~200 to 300 nm were successfully produced in the alloys. Tensile testing at elevated temperatures confirmed the advent of superplasticity with total elongations of more than 400 pct in all the alloys. It is demonstrated that the HPS can make all the alloys superplastic through processing at room temperature with a form of rectangular sheets.

    Original languageEnglish
    Pages (from-to)4669-4681
    Number of pages13
    JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
    Volume47
    Issue number9
    DOIs
    Publication statusPublished - Sep 1 2016

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics
    • Mechanics of Materials
    • Metals and Alloys

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