Transformation of BCC and B2 high temperature phases to HCP and orthorhombic structures in the Ti-Al-Nb system: Part I -- Microstructural predictions based on a subgroup relation between phases

Journal Article · · Journal of Research of the National Institute of Standards and Technology; (United States)

OSTI ID:5531160

Bemdersly, L A; Boettinger, W J ^[1]; Roytburd, A ^[2]

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1. National Inst. of Standards and Technology, Gaithersburg, MD (United States)
2. Univ. of Maryland, College Park, MD (United States). Dept. of Materials and Nuclear Engineering

Possible paths for the constant composition coherent transformation of BCC or B2 high temperature phases to low temperature HCP or Orthorhombic phases in the Ti-Al-Nb system are analyzed using a sequence of crystallographic structural relationships developed from subgroup symmetry relations. Symmetry elements lost in each step of the sequence determine the possibilities for variants of the low symmetry phase and domains that can be present in the microstructure. The orientation of inter domain interfaces is determined by requiring the existence of a strain-free interface between the domains. Polydomain structures are also determined that minimize elastic energy. Microstructural predictions are made for comparison to experimental results given by Bendersky and Boettinger.

• OSTI ID: 5531160
• Journal Information: Journal of Research of the National Institute of Standards and Technology; (United States), Journal Name: Journal of Research of the National Institute of Standards and Technology; (United States) Vol. 98:5; ISSN 1044-677X; ISSN JRITEF
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
ALUMINIUM ALLOYS
BCC LATTICES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
FORECASTING
HCP LATTICES
HEXAGONAL LATTICES
MICROSTRUCTURE
NIOBIUM ALLOYS
ORTHORHOMBIC LATTICES
TITANIUM ALLOYS
TITANIUM BASE ALLOYS