TY - JOUR
T1 - Effects of aging on stress-induced martensitic transformation in ductile Cu-Al-Mn-based shape memory alloys
AU - Sutou, Y.
AU - Koeda, N.
AU - Omori, T.
AU - Kainuma, R.
AU - Ishida, K.
N1 - Funding Information:
This work was supported by Grants-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS), from the Ministry of Education, Science, Sports and Culture, Japan, Core Research for Evolution Science and Technology (CREST), and from the Global COE project.
PY - 2009/11
Y1 - 2009/11
N2 - Effects of aging at 473-573 K on stress-induced martensitic transformation for textured Cu71.9Al16.6Mn9.3Ni2B0.2 and random-textured Cu72.1Al16.9Mn10.5Co0.5 shape memory alloy (SMA) wires with a large relative grain size d/D = 6 were investigated by cyclic tensile testing at room temperature, where d and D indicate mean grain size and wire diameter, respectively. The random-textured Cu72.1Al16.9Mn10.5Co0.5 wire cannot be uniformly deformed and the ductility is drastically reduced by aging treatment. On the other hand, in the textured Cu71.9Al16.6Mn9.3Ni2B0.2 SMA wire, the critical stress for martensitic transformation σt and the tensile strength σf are increased by aging without the associated loss of superelasticity (SE). Even in textured wire with a high σt of over 750 MPa, an excellent SE strain of about 6% can be obtained due to the formation of a fine bainite phase. Moreover, it was confirmed by in situ observation that stress-induced martensite plates grow, accompanying distortion of the bainite plates.
AB - Effects of aging at 473-573 K on stress-induced martensitic transformation for textured Cu71.9Al16.6Mn9.3Ni2B0.2 and random-textured Cu72.1Al16.9Mn10.5Co0.5 shape memory alloy (SMA) wires with a large relative grain size d/D = 6 were investigated by cyclic tensile testing at room temperature, where d and D indicate mean grain size and wire diameter, respectively. The random-textured Cu72.1Al16.9Mn10.5Co0.5 wire cannot be uniformly deformed and the ductility is drastically reduced by aging treatment. On the other hand, in the textured Cu71.9Al16.6Mn9.3Ni2B0.2 SMA wire, the critical stress for martensitic transformation σt and the tensile strength σf are increased by aging without the associated loss of superelasticity (SE). Even in textured wire with a high σt of over 750 MPa, an excellent SE strain of about 6% can be obtained due to the formation of a fine bainite phase. Moreover, it was confirmed by in situ observation that stress-induced martensite plates grow, accompanying distortion of the bainite plates.
KW - Aging
KW - Bainitic transformation
KW - Martensitic phase transformation
KW - Recrystallization texture
KW - Tension test
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U2 - 10.1016/j.actamat.2009.08.011
DO - 10.1016/j.actamat.2009.08.011
M3 - Article
AN - SCOPUS:70349764457
SN - 1359-6454
VL - 57
SP - 5759
EP - 5770
JO - Acta Materialia
JF - Acta Materialia
IS - 19
ER -