Microstructure Formation in Alpha-Beta Titanium Alloys
The observation of colony or Widmanstatten alpha in titanium alloys leads to the supposition that these alloys lack transformation nuclei at the transformation temperatures. Therefore,equiaxed alpha grains have usually been produced by the mechanical breakup of alpha laths and recrys-tallisation,to produce the bimodal and equiaxed microstructures in alpha-beta alloys such as Ti-64. Often these microstructures as a consequence contain large regions of common orientation associated with the original nucleation conditions, know as macrozones. However, increasing understanding of near-beta such as Ti-10-2-3 and Ti-5-5-5-3 is leading to the production of alpha nucleated within grains from heterogeneous nuclei such as dislocations and omega, with a range of interesting, and potentially very fine scale alpha morphologies. Recent developments in in situ synchrotron X-ray diffraction capability have also lead us to be able to characterise the kinetics of the alpha-beta and beta-alpha transformations, which can occur within seconds at temperatures high in the transus region. This leads to an improved understanding of how microstructures may be engineered in these alloys.
Beta Ti Alloys X-ray diffraction microstructure nucleation
David Dye Frederic Hu Nicholas G Jones
Department of Materials,Imperial College,South Kensington,London SW7 2AZ,UK
国际会议
The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)
北京
英文
404-409
2011-06-19（万方平台首次上网日期，不代表论文的发表时间）