フルイ　ミツアキ   古井　光明    所属   工学部 機械工学科    職種   教授
言語種別	英語
発行・発表の年月	2015/07
形態種別	学術論文
査読	査読あり
標題	Ultrafine-Grained magnesium-lithium alloy processed by high-pressure torsion: Low-temperature superplasticity and potential for hydroforming
執筆形態	共著
掲載誌名	Materials Science and Engineering: A
掲載区分	国外
出版社・発行元	ELSEVIER
巻・号・頁	640,pp.443-448
担当範囲	444-448
著者・共著者	Hirotaka Matsunoshita, Kaveh Edalati and Zenji Horita
概要	A Mg-Li alloy with 8 wt.% Li was processed by severe plastic deformation (SPD) through the process of high-pressure torsion (HPT) to achieve ultrafine grains with an average grain size of ~500 nm. Tensile testing with an initial strain rate of 10-3 s-1 showed that the alloy exhibited superplasticity at a temperature of 323 K or higher. Tensile testing in boiling water confirmed that the specimens were elongated to 350-480% at 373 K under the initial strain rates of 10-3 s-1 to 10-2 s-1 with a strain rate sensitivity of ~0.3. The current study suggests that not only superplastic forming but also superplastic hydroforming are feasible after the grain refinement using the HPT method.