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Title :疲労で形成された70/30黄銅, 85/15黄銅, 純銅のひずみ集中域の転位組織とき裂発生
Title alternative :Dislocation Structure of Strain Localized Region and Fatigue Crack Initiation in 70/30 Brass, 85/15 Brass and Pure Copper
Authors :兼城, 英夫
片桐, 一宗
屋富祖, 建樹
真壁, 朝敏
小林, 弘夫
Authors alternative :Kaneshiro, Hideo
Katagiri, Kazumune
Yafuso, Tateki
Makabe, Chobin
Kobayashi, Hiro-o
Issue Date :25-Apr-1990
Abstract :Although a number of models for the formation of extrusions and intrusions have been proposed, most of them are not considered to be sufficient. It is not yet clear whether or not the same mechanism may be responsible for the formation of extrusions in 70/30 brass, 85/15 brass and pure copper with different capability of cross slip. In this paper, investigations on dislocation structures of strain localized regions and fatigue crack initiation in these metals subjected to a long term stress cycling in vacuum were carried out by means of transmission electron microscopy. The strain localized regions bounded by two adjacent active glide layers were observed in the favorably oriented grains. Such strain localized regions were in close association with the formation of extrusion and transcrystalline cracking. At the intersections of the strain localized regions and the grain boundaries, extrusion-type deformations were sometimes formed due to the restraints of slip motions by the neighbouring grains.
Type Local :雑誌掲載論文
ISSN :03875008
Publisher :日本機械学会
URI :http://hdl.handle.net/20.500.12000/212
Citation :日本機械学会論文集. A編 = Transactions of the Japan Society of Mechanical Engineers. A Vol.56 no.524 p.51 -58
Appears in Collections:Peer-reviewed Journal Articles (Faculty of Engineering)

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