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Aging Effects in Copper-Based Shape Memory Alloys

Journal Article


Abstract


  • Aging of three copper-based shape memory alloys was studied by measuring the time dependence of hardness, martensitic transformation temperatures, lattice parameters, and shape memory capability at temperatures in the range 200 to 450°C. The ultimate loss of the shape memory effect in each alloy was preceded by changes in the other properties which resulted from thermally activated processes having activation energies in the range 60 to 80 kJ mol-1. At temperatures above about 300°C the aging process involved the eventual formation of α and γ2 phases. Although the activation energy appears to be insensitive to temperature and alloy composition, at lower temperatures other thermally activated processes, such as change in the type or degree of order, may, at least in the initial stages, be significant aging phenomena. © 1982 American Society for Metals and the Metallurgical Society of AIME.

Publication Date


  • 1982

Citation


  • Kennon, N. F., Dunne, D. P., & Middleton, L. (1982). Aging Effects in Copper-Based Shape Memory Alloys. Metallurgical Transactions A, 13(4), 551-555. doi:10.1007/BF02644418

Scopus Eid


  • 2-s2.0-0020114681

Web Of Science Accession Number


Start Page


  • 551

End Page


  • 555

Volume


  • 13

Issue


  • 4

Abstract


  • Aging of three copper-based shape memory alloys was studied by measuring the time dependence of hardness, martensitic transformation temperatures, lattice parameters, and shape memory capability at temperatures in the range 200 to 450°C. The ultimate loss of the shape memory effect in each alloy was preceded by changes in the other properties which resulted from thermally activated processes having activation energies in the range 60 to 80 kJ mol-1. At temperatures above about 300°C the aging process involved the eventual formation of α and γ2 phases. Although the activation energy appears to be insensitive to temperature and alloy composition, at lower temperatures other thermally activated processes, such as change in the type or degree of order, may, at least in the initial stages, be significant aging phenomena. © 1982 American Society for Metals and the Metallurgical Society of AIME.

Publication Date


  • 1982

Citation


  • Kennon, N. F., Dunne, D. P., & Middleton, L. (1982). Aging Effects in Copper-Based Shape Memory Alloys. Metallurgical Transactions A, 13(4), 551-555. doi:10.1007/BF02644418

Scopus Eid


  • 2-s2.0-0020114681

Web Of Science Accession Number


Start Page


  • 551

End Page


  • 555

Volume


  • 13

Issue


  • 4