Variant selection in {alpha} {yields} {beta} {yields} {alpha} phase transformation of cold rolled titanium sheet

Journal Article · Mon Apr 15 04:00:00 EDT 1996 · Scripta Materialia

DOI:https://doi.org/10.1016/1359-6462(95)00659-1· OSTI ID:230765

Zhu, Z S; Gu, J L; Chen, N P ^[1]

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1. Tsinghua Univ., Beijing (China). Dept. of Materials Science and Engineering

It is well known that {alpha} {yields} {beta} {yields} {alpha} phase transformation in titanium proceeds with a definite orientation relationship between parent and product phases, i.e., the Burgers` relationship, namely, {l_brace}110{r_brace}{sub {beta}} {parallel} (0001){sub {alpha}} and <111>{sub {beta}} {parallel} <11{bar 2}0>{sub {alpha}}. Because of the crystal symmetry, starting with a single component of texture in {alpha} phase, a total of 72 reorientations are possible with equal probability after the double {alpha} {yields} {beta} {yields} {alpha} transformation. According to this assumption, it can be deduced that repeated cycling through the transformation sequence should result in a random texture. In fact, this is, however, not often the case. Some orientation variants are preferentially selected during cyclic {alpha} {yields} {beta} {yields} {alpha} phase transformation in titanium sheet. This has been called variant selection. Although many investigations have been made towards understanding the mechanism involved in the variant selection taking place in cubic crystal metals, there is limited work dealing with the phase transformation in hexagonal close packed (HCP) metals like {alpha}-titanium and its alloys. It is therefore necessary to obtain detailed information on this subject.

• OSTI ID: 230765
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 8 Vol. 34; ISSN 1359-6462; ISSN XZ503X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANNEALING
COLD WORKING
CRYSTAL-PHASE TRANSFORMATIONS
HCP LATTICES
IMPURITIES
ORIENTATION
SAMPLE PREPARATION
SHEETS
TEXTURE
TITANIUM
X-RAY DIFFRACTION