TY - JOUR
T1 - Isothermal aging behaviors of coppertitaniummagnesium supersaturated solid-Solution alloys
AU - Saito, Kaichi
AU - Suzuki, Makio
AU - Semboshi, Satoshi
AU - Sato, Katsuhiko
AU - Hayasaka, Yuichiro
N1 - Funding Information:
This work was performed under the inter-university cooperative research program (Proposal No. 19G0004) of the Cooperative Research and Development Center for Advanced Materials, Institute for materials Research, Tohoku University. A part of this work was supported by Tohoku University, Microstructural Characterization Platform in Nanotechnology Platform Project sponsored by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. It was also supported by Japan Copper and Brass Association foundation in 2019. This research was funded by the Japan Society for the Promotion of Science (JSPS) as a Grant-in-Aid for Scientific Research (B) (No. 18H01743).
Publisher Copyright:
© 2020 The Japan Institute of Metals and Materials.
PY - 2020/10/1
Y1 - 2020/10/1
N2 - Herein, the isothermal aging behavior of coppertitaniummagnesium (CuTiMg) supersaturated solid-solution alloys, with different compositions, under test conditions of 450°C for 100 h, has been thoroughly investigated in a comparative study using various electron microscopy and microanalytical techniques. The Vickers hardness and electrical conductivity of the ternary alloys were recorded at slightly elevated (during aging) and reduced levels than their binary counterparts without Mg doping. Hence, it is proposed that the hardness and conductivity values are approximated from the superposition effect of precipitation hardening stimulated by Ti solutes and solution hardening by both Ti and Mg solutes. Furthermore, the tensile tests for these ternary specimens have demonstrated that Mg doping has a substantial effect on the improvement of the tensile strength and fracture elongation properties of binary CuTi alloys. Aberration-corrected high-angle annular darkfield scanning transmission electron microscopy imaging combined with atomic-resolution energy-dispersive X-ray spectroscopy mapping analysis confirmed that the same metastable precipitate phase is responsible for peak hardening in ternary and CuTi binary alloys. In addition, a large part of the Mg solutes is homogeneously distributed over the matrix regions, while there is also a smaller part of those present in the precipitates. The potential effects of Mg doping on the microstructures of CuTi alloys were elucidated and the structural environment, which may yield relatively high mechanical properties, was discussed using the aforementioned observations.
AB - Herein, the isothermal aging behavior of coppertitaniummagnesium (CuTiMg) supersaturated solid-solution alloys, with different compositions, under test conditions of 450°C for 100 h, has been thoroughly investigated in a comparative study using various electron microscopy and microanalytical techniques. The Vickers hardness and electrical conductivity of the ternary alloys were recorded at slightly elevated (during aging) and reduced levels than their binary counterparts without Mg doping. Hence, it is proposed that the hardness and conductivity values are approximated from the superposition effect of precipitation hardening stimulated by Ti solutes and solution hardening by both Ti and Mg solutes. Furthermore, the tensile tests for these ternary specimens have demonstrated that Mg doping has a substantial effect on the improvement of the tensile strength and fracture elongation properties of binary CuTi alloys. Aberration-corrected high-angle annular darkfield scanning transmission electron microscopy imaging combined with atomic-resolution energy-dispersive X-ray spectroscopy mapping analysis confirmed that the same metastable precipitate phase is responsible for peak hardening in ternary and CuTi binary alloys. In addition, a large part of the Mg solutes is homogeneously distributed over the matrix regions, while there is also a smaller part of those present in the precipitates. The potential effects of Mg doping on the microstructures of CuTi alloys were elucidated and the structural environment, which may yield relatively high mechanical properties, was discussed using the aforementioned observations.
KW - Coppertitaniummagnesium alloy
KW - EDS
KW - Electrical conductivity
KW - HAADF-STEM
KW - Mechanical properties
KW - Precipitation-hardening
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U2 - 10.2320/matertrans.MT-M2020149
DO - 10.2320/matertrans.MT-M2020149
M3 - Article
AN - SCOPUS:85092283714
VL - 61
SP - 1912
EP - 1921
JO - Materials Transactions
JF - Materials Transactions
SN - 1345-9678
IS - 10
ER -