Degenerated lamellar microstructure with an increased propensity for 120{degree}-rotational boundaries in a Ti-48Al alloy formed upon annealing
- Taiyuan Univ. of Technology (China). Center of Testing and Measuring
The lamellar structures of the {gamma}(TiAl)-phase coexisting with a small amount of {alpha}{sub 2}(Ti{sub 3}Al)-phase in two-phase TiAl-base alloys have been studied extensively. It has been shown that {gamma}-lamellae and {alpha}{sub 2}-lamellae have the orientation relationship: {l_brace}111{r_brace}{sub {gamma}}{parallel}(0001){sub {alpha}{sub 2}} and [{l_angle}110]{sub {gamma}}{parallel}{l_angle}11{bar 2}0{r_angle}{sub {alpha}{sub 2}}. So in one lamella colony, {gamma}-lamellae may exist in six possible orientation variants with three possible kinds of interfaces between them. Furthermore, it was found that the true-twin interfaces constituted the majority of lamellar interfaces in PST and as-cast alloys. This paper reports an observation of the increased propensity for 120{degree}-rotational boundaries in a two-phase TiAl-base alloy upon annealing.
- OSTI ID:
- 352435
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 9 Vol. 40; ISSN 1359-6462; ISSN SCMAF7
- Country of Publication:
- United States
- Language:
- English
Similar Records
{gamma} + {alpha}{sub 2} + B2 lamellar domains in rolled TiAl
A quantitative TEM analysis of the lamellar microstructure in TiAl based alloys