Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 28, Issue 2, Pages 273-281Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(18)64660-6
Keywords
Ti-5Al-5Mo-5V-3Cr alloy; high throughput method; pseudo-spinodal decomposition; temperature gradient; microstructure; mechanical properties
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Funding
- National Basic Research and Development Project of China [2014CB644002]
- Innovation-driven Plan in Central South University, China [2015CX004]
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A new high throughput heat-treatment method with a continuous temperature gradient between 600 and 700 degrees C was utilized on the Ti-5553 alloy (Ti-5Al-5Mo-5V-3Cr, mass fraction, %). The temperature gradient was induced by the variation of the axial section of sample, which was heated by the direct current. The variation of continuous cooling rates on the treated sample was realized by using the end quenching method. The microstructural evolution and mechanical properties under different heat treatment conditions were evaluated. The results show that the pseudo-spinodal decomposition of the alloy occurs at (617 +/- 1) degrees C, and the size of the precipitated alpha phase is around 300 nm. Moreover, the highest microhardness is obtained after the heat treatment at the pseudo-spinodal decomposition temperature for 4 h. These indicate that the high throughput method is efficient and fast to determine the phase transformation temperature and corresponding microstructural evolution of alloys.
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