No abstract

Stress fluctuation, deformation band, and strain marking in a tensile deformed 5083 aluminum alloy plate at 318K were examined using an Instron tensile machine, a stylus surface profiler, and strain gauges; related temperature dependencies were also investigated. A saw-tooth stress fluctuation was generated in the nominal stress vs. nominal strain curves in two different deformation regions, a yield point region and a region advanced by plastic deformation. A surface profiler revealed that an intermittent formation of the deformation band, known as a parallel band, resulted in both a saw-toothlike stress fluctuation and a stair-like strain increase. The temperature dependencies of stress fluctuation, deformation band, and strain marking indicated that changes from a wavy stress fluctuation to a saw-tooth-like one with increasing deformation temperature were due to a variation in the propagation velocity and a repetition of the intermittent formation of the deformation band.

山梨大学大学院工学研究科大学院生(〒400 8511 山梨県甲府市武田 4 3 11) "Graduate student, School of Engineering, Yamanashi University (4 3 11. Takeda, Kofu-shi, Yamanashi 400 8511). E-mail: g01ds010＠ccn.yamanashi.ac.jp  山梨大学大学院工学研究科大学院生(甲府市) 〔現在三菱ÚÂae›ç 株 (神戸町) 〕 "Graduate student, School of Engineering, Yamanashi University (Kofu-shi, Yamanashi)〔Present: MITSUBISHI MATERIAL Co. Ltd. (Godo-cho, Gifu)〕.   山梨大学工学部機械³µÂÜ工学科学生(甲府市) 〔現在 株£ÊÞÄ(上野原町) 〕 "Student, Department of Mechanical System Engineering, Faculty of Engineering, Yamanashi University (Kofu-shi, Yamanashi) 〔Present: ENOMOTO CO. Ltd. (Uenohara-cho, Yamanashi)〕.    山梨大学工学部機械³µÂÜ工学科(甲府市) "Department of Mechanical System Engineering, Faculty of Engineering, Yamanashi University (Kofu-shi, Yamanashi).  1 実験試料jn規格˜越G' Cu K含}'eC'^ƒ#熱処理j 伴E Cu m存在状態m変化K•èô³ãïj及{X影響˜今後 検討X'必要KA'g思•''"  2 先m研究結果#復元処理m容易度ih˜考慮Ve#時効処理温 度n403 K gV^" 研究論文