Strain-Rate and Temperature Dependences of Deformation Behavior of AZ61Mg Alloy Processed by Multi-directional Forging Under Decreasing Temperature Conditions

フォーマット:

論文

責任表示:

Watanabe, Chihiro ; Monzen, Ryoichi ; Ueji, Rintaro ; Miura, Hiromi ; 渡邊, 千尋 ; 門前, 亮一

言語:

英語

出版情報:

Springer Boston, 2017-11-01

著者名:

Watanabe, Chihiro

Monzen, Ryoichi

Ueji, Rintaro

Miura, Hiromi

渡邊, 千尋

門前, 亮一

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掲載情報:

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

ISSN:

1073-5623      

巻:

48

通号:

11

開始ページ:

5368

終了ページ:

5375

バージョン:

author

概要:

金沢大学理工研究域機械工学系<br />Strain-rate and temperature dependences of deformation behavior of ultrafine-grained (UFGed) AZ61Mg alloy were examined. For this purpose, AZ61Mg alloy specimens were subjected to multi-directional forging (MDFing) … under decreasing temperature conditions to have various grain sizes. The average grain sizes attained by MDFing to 1, 3, 6 and 9 passes were approximately 8, 2, 0.5 and 0.3 μm, respectively. A superior balance of the mechanical properties of strength and ductility at room temperature was achieved by MDFing to three passes and over. The strain-rate sensitivity of mechanical properties of the MDFed specimens increased with decreasing grain size. The specimens with grain sizes of 0.5 and 0.3 μm (0.5 or 0.3 specimen) exhibited stronger strain-rate and temperature dependences of total elongation than those with grain sizes of 8 and 2 μm (8 or 2 specimen). This can be partially ascribed to grain-boundary sliding, since an AFM observation revealed the occurrence of room-temperature grain-boundary sliding in the 0.3 specimen. The activation volume V* for the 8, 2 and 0.5 specimen increased with increasing temperature, while the 0.3 specimen exhibited an inverse temperature dependence of V*. This suggests a change in deformation mechanism with decreasing grain size as well as the occurrence of grain-boundary sliding. © 2017 The Minerals, Metals & Materials Society and ASM International<br />Embargo Period 12 months<br />The final publication is available at www.springerlink.com/article/10.1007/s11661-017-4303-7 続きを見る

URL:

http://hdl.handle.net/2297/00049524