Deformation behavior of A{sub 2}-lamellae in fully lamellar Ti-48Al-2Mn-2Nb at room temperature
- Ohio State Univ., Columbus, OH (United States). Dept. of Materials Science and Engineering
- Univ. of Birmingham, Edgbaston (United Kingdom). IRC in Materials for High Performance Applications
The alloy Ti-48at.% Al-2at.% Mn-2at.% Nb (Ti-48Al-2Mn-2Nb) is a member of a new class of generic two-phase TiAl based alloys which will be referred to as {gamma}-alloys in the following. In general, polycrystalline {gamma}-alloys will always contain a number of lamellar grains which exhibit hard orientation behavior during loading. As a result, it may be predicted that the plastic properties of the minority {alpha}{sub 2}-Ti{sub 3}Al phase critically affect the deformation and fracture behavior of {gamma}-alloys containing lamellar colonies. Hence, in order to understand the plasticity and strength of {gamma}-alloys it is important to elucidate the deformation behavior of the {alpha}{sub 2}-Ti{sub 3}Al lamellae during loading in the hard orientations. In the present work the deformation modes in hard oriented grains of room temperature compressed fully lamellar Ti-48Al-2Mn-2Nb have been studied by transmission electron microscopy (TEM). Particular attention has been paid to the deformation characteristics exhibited by the {alpha}{sub 2}-lamellae and to deformation transfer processes between the two constituent phases. In this paper the results obtained for lamellar grains loaded approximately parallel to the interface normal, [0001]{alpha}{sub 2}//[111]{gamma}, are presented and discussed with respect to mechanical properties of {gamma}-alloys.
- Sponsoring Organization:
- National Science Foundation, Washington, DC (United States)
- OSTI ID:
- 605677
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 5 Vol. 38; ISSN 1359-6462; ISSN SCMAF7
- Country of Publication:
- United States
- Language:
- English
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