Mechanical and electrical properties and microstructure in Cu-Ni-Be alloys

被引：12

作者：

Ota, Satoshi ^{[1
]}

Muramatsu, Naokuni ^{[1
]}

Sengoku, Kazumasa ^{[2
]}

Watanabe, Chihiro ^{[3
]}

Monzen, Ryoichi ^{[3
]}

机构：

[1] NGK Insulators Ltd., Handa

[2] Kanazawa Univ., Kanazawa

[3] Graduate School of Natural Sci., Kanazawa Univ., Kanazawa

来源：

Zairyo/Journal of the Society of Materials Science, Japan | 2007年 / 56卷 / 06期

关键词：

γ″ precipitates; Cu-Ni-Be alloy; Electrical conductivity; Precipitation strengthening; Recrystallization;

D O I：

10.2472/jsms.56.531

中图分类号：

学科分类号：

摘要：

The yield strength and electrical conductivity of precipitation-hardenable Cu-2.05mass%Ni-0.35mass%Be and Cu1.27mass%Ni-0.22mass%Be alloys aged at 360 to 560°C after cold rolling have been investigated. The former alloy exhibits a higher strength and a lower electrical conductivity in the under-aging and peak-aging stages, but a lower strength and a higher electrical conductivity in the over-aging stage than the latter alloy. Both alloys are hardened by plate-shaped coherent precipitates of γ″ phase, which is body-centered tetragonal with a = b = 0.24nm and c = 0.28nm. In the peak-aging stage, the yield strength of both alloys is controlled by the precipitate shearing mechanism. Both alloys recrystallize in the over-aging stage at the coarse y precipitates which are residual even after solutionizing. A higher number density of the coarse y precipitates in the Cu-2.05%Ni-0.35%Be alloy gives rise to a larger volume fraction of recrystallization, resulting in a greater decrease in strength. The growth of incoherent precipitates in recrystallized grains is faster than that of coherent γ″ precipitates in unrecrystallized grains. This causes a higher electrical conductivity of the Cu-2.05%Ni-0.35%Be alloy in the over-aging stage. © 2007 The Society of Materials Science.

引用

页码：531 / 536

页数：5

共 20 条

[1]

Shimizu K., Mikami Y., Mitani H., Otuka K., Electron microscopy study of the precipitation processes in Cu-2wt%Be alloy, Journal of the Japan Institute of Metals, 34, 11, pp. 1108-1115, (1970)

[2]

Rioja R.J., Laughlin D.E., The sequence of precipita-tion in Cu-2wt%Be alloys, Acta Metallurgica, 28, 9, pp. 1301-1313, (1980)

[3]

Monzen R., Seo T., Sakai T., Watanabe C., Precipitation processes in a Cu-0.9mass%Be single crystal, Materials Transactions, 47, 12, pp. 2925-2934, (2006)

[4]

Guha A., Development of a high strength high conductivity Cu-Ni-Be alloy, Proceedings of the annual meeting of Metallurgical Society of AIME, pp. 133-145, (1984)

[5]

Plantz D.H., Dodd R.A., Kulcinski G.L., Mechanical property changes in Ion-irradiated metals : Part II. High-strength Cu-Ni-Be alloy, Metallurgical Transactions A, 20, 12, pp. 2689-2693, (1989)

[6]

Spaic S., Markoli B., Microstructural characterization of alloys of the quasibinary Cu-NiBe system, Zeitschrift für Metallkunde, 94, 8, pp. 876-879, (2003)

[7]

Humphreys F.J., Hatherly M., Recrystallization and related annealing phenomena, pp. 235-279, (1995)

[8]

Pawlek F., Reichel K., The influence of impurities on the electrical conductivity of copper, Zeitschrift für Metallkunde, 47, 6, pp. 347-356, (1956)

[9]

Osamura K., Ochiai S., Uehara T., Precipitation behavior and change of yield strength during artificial aging in Al-Zn-Mg-Cu alloys, 34, 9, pp. 517-524, (1984)

[10]

Marquis E.A., Seidman D.N., Dunand D.C., Effect of Mg addition on the creep and yield behavior of an Al-Sc alloy, Acta Materialia, 51, 16, pp. 4751-4760, (2003)

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