銅と銅合金
Online ISSN : 2435-872X
Print ISSN : 1347-7234
機械的性質
巨大ひずみ加工で作製された高強度超微細結晶粒Cu–Si固溶体合金の引張変形挙動
國峯 崇裕都丸 耀平渡邉 美波門前 亮一
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2020 年 59 巻 1 号 p. 299-303

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Tensile deformation behavior of high–strength nanostructured Cu–Si solid–solution alloys processed by high–pressure torsion (HPT) with 5 rotations was investigated at room and low temperatures. With increasing Si concentration, tensile strength of the nanostructured Cu–Si solid–solution alloys was significantly increased. The maximal tensile strengths were 980 MPa at room temperature, and 1350 MPa at 77 K in a Cu–2.04wt.%Si alloy. This significant strengthening was achieved by grain refinement and increased dislocation density through severe plastic deformation (SPD) with the effect of Si addition on the decreasing stacking fault energy of the Cu–Si alloy. With increasing Si concentration, strain–rate sensitivity of the nanostructured Cu–Si solid–solution alloys was decreased due to the increased dislocation density, resulting in accelerating plastic instability of tensile specimens, caused by the diminishing strain–rate hardening capacity after necking.

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© 2020 日本銅学会
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