Research of microstructure and mechanical behavior on duplex (α plus β) Ti-4.8Al-2.5Mo-1.4V alloy

JOURNAL OF ALLOYS AND COMPOUNDS

卷:490

Article

Peng, Pei-Wen^2,3,4  Ou, Keng-Liang^3,4,5  Chao, Chih-Yeh⁶  Pan, Yung-Ning²  Wang, Chau-Hsiang^1,7 

[1] Kaohsiung Med Univ, Coll Dent Med, Sch Dent, Kaohsiung 807, Taiwan

[2] Natl Taiwan Univ, Dept Mech Engn, Taipei 106, Taiwan

[3] Taipei Med Univ, Res Ctr Biomed Implants & Microsurg Devices, Taipei 110, Taiwan

[4] Taipei Med Univ, Res Ctr Biomed Devices, Taipei 110, Taiwan

[5] Taipei Med Univ, Coll Oral Med, Grad Inst Biomed Mat & Engn, Taipei 110, Taiwan

[6] Pingtung Univ Sci & Technol, Dept Mech Engn, Pingtung 912, Taiwan

[7] Kaohsiung Med Univ Hosp, Dept Dent, Kaohsiung 807, Taiwan

关键词: Titanium alloy;    Mechanical properties;    Transmission electron microscopey;    Microstructure;    Damping coefficient;   

DOI  :  10.1016/j.jallcom.2009.10.133

来源: Elsevier

【 摘 要 】

The microstructure and mechanical behavior of the duplex Ti-4.8Al-2.5Mo-1.4V (Ti14) alloy were investigated by means of optical microscopy, electron microscopy, experimental model analysis, and hardness and tensile testing. During heat-treatment at between 600 and 1000 degrees C, the phase transformation sequence was found to be (alpha + beta) -> (alpha + beta + alpha') -> (alpha' + alpha '' + residual beta). The (alpha'+ alpha '' + residual beta) structure exhibited the maximum yield strength (sigma(y) = 920 MPa), hardness (HRC 36), and damping coefficient (188.3 X 10(-4)). However, the (alpha + beta) structure achieved the greatest elongation (similar to 15%). It is believed that the lath-like alpha' martensite not only increases the tensile strength, but also enhances the hardness of the Ti14 alloy. Moreover, it also plays a crucial role in increasing the damping capacity of the Ti14 alloy, (C) 2009 Elsevier B.V. All rights reserved.

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