Microstructural control of Al3Ti-based alloys designed by multi-component phase diagrams

Seiji Miura, Juri Fujinaka, Tetsuo Mori

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In the Al-Mo-Ti ternary system, a bcc-phase field extends from the Ti-Mo edge to high-Al region at high temperatures, and at low temperature the low Ti region is replaced partially by a two-phase region composed of an A15-Mo3Al and a D022-Al3Ti phases. It enables us to form a fine lamellar structure. Besides, most of the Ll2-trialuminides stabilizing elements also act as the bcc-βTi phase stabilizer. So, the designing of the bcc-Ll2 two-phase alloys also can be expected by adding them to the Al-Mo-Ti alloys. In order to apply such ideas for microstructural control, a series of studies on the phase relations in the Al-Mo-Ti-X quaternary systems have been carried out to introduce an Ll2-(Al,X)3Ti phase and/or bcc phase for ductile-phase toughening. It is found that, by additions of X = Cr, an Ll2-(Al,Cr)3Ti phase appears near the two-phase region composed of the D022-Al3Ti and bcc phases. By heat treatments, the D022-Al3Ti and/or Ll2-(Al,Cr)3Ti phases precipitates from the bcc phase, and no voids are observed. The mechanical properties of these alloys are also investigated by Vickers indentation tests.

Original languageEnglish
Title of host publicationProcessing and Fabrication of Advanced Materials X
EditorsT.S. Srivatsan, R.A. Varin, T.S. Srivatsan, R.A. Varin
Pages287-300
Number of pages14
Publication statusPublished - 2001 Dec 1
EventProcessing and Fabrication of Advanced Materials X - Indianapolis, IN, United States
Duration: 2001 Nov 52001 Nov 8

Publication series

NameProcessing and Fabrication of Advanced Materials X

Other

OtherProcessing and Fabrication of Advanced Materials X
CountryUnited States
CityIndianapolis, IN
Period01/11/501/11/8

ASJC Scopus subject areas

  • Engineering(all)

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