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論文

論文
Monzen, Ryoichi ; Takagawa, Yusaku ; Watanabe, Chihiro ; Terada, Daisuke ; Tsuji, N.
出版情報: Procedia Engineering.  10  pp.2417-2422,  2011-01-01.  Elsevier
URL: http://hdl.handle.net/2297/29480
概要: The enhancement of strength of Cu-1.2wt%Ni-0.2wt%Be-0.1wt%Zr and Cu-1.4wt%Ni-0.25wt%P-0.1wt%Zr alloys has been tried by the combination of ARB process by 5 cycles and aging treatment at 350 to 450°C. The grain sizes of the alloys, severely deformed by 5-cycle ARB process, were refined down to about 0.4μm. The Cu-Ni-Be-Zr alloy, ARB-processed and peak-aged at 375°C, exhibited a tensile strength σu of 810MPa, an elongation εt of 9% up to failure and an electrical conductivity σ of 62%IACS. The Cu-Ni-P-Zr alloy, initially aged at 450°C, then ARB-processed and peak-aged at 400°C, had the values of σu=780MPa, εt =6% and σ=56%IACS. © 2011 Published by Elsevier Ltd. 続きを見る
2.

論文

論文
松岡, 秀明 ; 広瀬, 幸雄 ; 岸, 陽一 ; 東, 健司
出版情報: 材料=Journal of the Society of Materials Science, Japan.  46  pp.665-670,  1997-06-15.  日本材料学会
URL: http://hdl.handle.net/2297/12323
概要: 金沢大学大学院自然科学研究科<br />The strengthening of Al-Zn-Mg-Cu system alloy results from the interaction between dislocation and s olute atoms or precipitates. In this study, the tensile properties of 7475 aluminum alloys having various average grain sizes were evaluated. The 0.2% proof stress and elongation were discussed based on the theory of dislocation mechanism and the observation of microstructures. The main results obtained were as follows: (1) The 0.2% proof stress, tensile strength and elongation of the materials increased with decreasing average grain size. (2) In accordance with the Hall-Petch's relation, the 0.2% proof stress was plotted against the reciprocal square root of the average grain size of the aluminum matrix. A good correlation was obtained, indicating that the 0.2% proof stress depends on the average grain size of the aluminum matrix. (3) The contributions of the precipitation strengthening, solid strengthening, solid strengthening and grain refining effect to the 0.2% proof stress of the present 7475 aluminum alloy were estimated to be 258, 153 and 5 MPa, respectively. 続きを見る
3.

論文

論文
松岡, 秀明 ; 広瀬, 幸雄 ; 岸, 陽一 ; 東, 健司
出版情報: 材料=Journal of the Society of Materials Science, Japan.  45  pp.537-543,  1996-05-15.  日本材料学会
URL: http://hdl.handle.net/2297/12325
概要: 金沢大学大学院自然科学研究科<br />Two types of Al-Zn-Mg-Cu system alloys with different microstructures, i.e., a fully recrystallized fine-grain and an un-recrystallized sub-grain, were prepared to investigate their tensile properties and stress corrosion cracking, SCC, resistance. The former is the superplastic material(SP), and the latter is a typical one of the commercial materials(CM). The effects of grain shapes and orientation on SCC resistance were discussed on the basis of the SCC test and fractography. The main results obtained in the present work are as follows:(1)When the orientations, L and T, of specimens were in agreement to rolling direction, the values of mechanical Young's modulus, tensile strength and 0.2 % proof stress of both SP and CM materials were nearly equal. However, the elongation of CM material was higher than SP one. (2)The nucleation time and life of SCC on L-and T-directions of CM material were longer than those of SP one. SCC resistance in the CM material was superior to that in the SP material. (3)Anisotropy of specimen orientation for SCC life was not observed in the SP material. In the CM material, on the other hand, SCC life on L-direction was longer than that of T-direction. The anisotropy on SCC life observed in the CM material seemed to be related to an easy separation of interfaces between the matrix and the inclusions having Fe and Si elements existing continuously along the grain boundaries by hot rolling. 続きを見る