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

Pei Wen Peng, Keng Liang Ou, Chih Yeh Chao, Yung Ning Pan, Chau Hsiang Wang

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


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 °C, the phase transformation sequence was found to be (α + β) → (α + β + α′) → (α′ + α″ + residual β). The (α′ + α″ + residual β) structure exhibited the maximum yield strength (σy = 920 MPa), hardness (HRC 36), and damping coefficient (188.3 × 10-4). However, the (α + β) structure achieved the greatest elongation (∼15%). It is believed that the lath-like α′ 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.

Original languageEnglish
Pages (from-to)661-666
Number of pages6
JournalJournal of Alloys and Compounds
Issue number1-2
Publication statusPublished - Feb 4 2010


  • Damping coefficient
  • Mechanical properties
  • Microstructure
  • Titanium alloy
  • Transmission electron microscopey

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Chemistry
  • Metals and Alloys


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