Contributions to transformation superplasticity of titanium from rigid particles and pressurized pores

Journal Article · Fri May 07 04:00:00 EDT 1999 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(99)00068-8· OSTI ID:361727

Schuh, C; Dunand, D C ^[1]

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1. Northwestern Univ., Evanston, IL (United States). Dept. of Materials Science and Engineering

Polymorphic materials which are subjected to an external stress while their temperature is repeatedly cycled about their phase transformation range experience, on average, Newtonian flow, which is driven by the biasing of internal transformation mismatch stresses by the external stress. This phenomenon, termed transformation superplasticity, is well documented for metals and has recently been demonstrated for metal-matrix composites (MMCs) with a polymorphic matrix and a discontinuous, non-transforming reinforcement phase. The first report of transformation superplasticity of a MMC was that published by Dunand and Bedell (D and B), who examined commercial-purity titanium (CP-Ti) reinforced with 10 vol. % particulate TiC. In the current investigation of transformation superplasticity of materials with the same nominal composition as those used in the original study of D and B, the authors have become aware of a microstructural feature of the experimental material which affects the superplastic strain increments, and which results in differences between the data of the two studies. In the present paper, the authors report the details of this effect and critically re-examine the original conclusions of D and B.

• OSTI ID: 361727
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 11 Vol. 40; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPOSITE MATERIALS
CRYSTAL-PHASE TRANSFORMATIONS
PLASTICITY
STRAINS
STRESSES
THERMAL CYCLING
TITANIUM
TITANIUM OXIDES