TY - JOUR
T1 - Young's modulus and mechanical properties of Ti-29Nb-13Ta-4.6Zr in relation to α″ martensite
AU - Hao, Y. L.
AU - Niinomi, M.
AU - Kuroda, D.
AU - Fukunaga, K.
AU - Zhou, Y. L.
AU - Yang, R.
AU - Suzuki, A.
N1 - Funding Information:
Some parts of this research have been supported by NEDO (New Energy and Industrial Technology Development Organization, Tokyo), Grant-in-Aid for Promoting Scientific Frontier Research from the Ministry of Education, Science and Culture (Tokyo), Grant-in-Aid for Scientific Research from Japan Society for the Promotion of Science (Tokyo), Mitsubishi Foundation (Tokyo), Tokai Foundation (Toyohashi), the Iron and Steel Institute of Japan (Tokyo) and the Light Metal Education Foundation (Osaka). YLH and RY’s research at IMR CAS has been supported by the National Science Foundation of China (Grant No. 59925103) and the Ministry of Science and Technology of China (Grant No. G2000067105).
PY - 2002/10
Y1 - 2002/10
N2 - An investigation on the formation of α″ martensne and its influence on Young s modulus and mechanical properties of forged Ti-29Nb-13Ta-4.6Zr (wt pct) alloy is reported in this article. For ice-water-quenched specimens after solution treatment at 1023, 1123, and 1223 K in the single β-phase field for 1.8, 3.6, 14.4, and 28.8 ks, X-ray diffraction and internal friction measurements showed that the volume fraction of the α″ martensite changes with both solution temperature and time. This effect has been attributed mainly to the influence of grain size of the β-parent phase on the stability of the β phase and, consequently, on the martensitic start (Ms) temperature. A critical grain size of 40 μm was identified for the β phase, below which the martensitic transformation is largely suppressed because of low Ms temperature. With the β grain size increasing above this critical value, the volume fraction of the α″ martensite increases significantly at first and then decreases gradually with further grain growth. The α″ martensite was shown to possess good ductility and, compared to the β phase, lower strength and hardness but nearly identical Young's modulus in the studied alloy.
AB - An investigation on the formation of α″ martensne and its influence on Young s modulus and mechanical properties of forged Ti-29Nb-13Ta-4.6Zr (wt pct) alloy is reported in this article. For ice-water-quenched specimens after solution treatment at 1023, 1123, and 1223 K in the single β-phase field for 1.8, 3.6, 14.4, and 28.8 ks, X-ray diffraction and internal friction measurements showed that the volume fraction of the α″ martensite changes with both solution temperature and time. This effect has been attributed mainly to the influence of grain size of the β-parent phase on the stability of the β phase and, consequently, on the martensitic start (Ms) temperature. A critical grain size of 40 μm was identified for the β phase, below which the martensitic transformation is largely suppressed because of low Ms temperature. With the β grain size increasing above this critical value, the volume fraction of the α″ martensite increases significantly at first and then decreases gradually with further grain growth. The α″ martensite was shown to possess good ductility and, compared to the β phase, lower strength and hardness but nearly identical Young's modulus in the studied alloy.
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U2 - 10.1007/s11661-002-0299-7
DO - 10.1007/s11661-002-0299-7
M3 - Article
AN - SCOPUS:0036810617
SN - 1073-5623
VL - 33
SP - 3137
EP - 3144
JO - Metallurgical Transactions A (Physical Metallurgy and Materials Science)
JF - Metallurgical Transactions A (Physical Metallurgy and Materials Science)
IS - 10
ER -