Phase Transformations in Ti-15Mo Investigated by in situ Electrical Resistance

• Authors: P. Zháňal , P. Harcuba , J. Šmilauerová , J. Stráský , M. Janeček , B. Smola , M. Hájek
• Languages of publication: EN

Abstracts

EN

In this study phase transformations in metastable beta Ti-15Mo alloy were investigated by an in situ electrical resistance measurement in a wide range of temperatures from -196°C to 850°C. Different temperature ranges of the evolution of electrical resistance were correlated with underlying phase transformations. In the low temperature range, stage I (from -196°C to 220°C) the decrease of electrical resistance with increasing temperature is caused by the dissolution of ω_{ath} (formed during quenching by athermal shuffle transformation) which is accompanied by the relaxation of lattice strain, while the diffusional assisted growth of ω_{iso} in the range from 220°C to 380°C (stage II) is the main mechanism causing the increase of resistance. Another decrease of the resistance in the range from 380°C to 550°C (stage III) is explained by the dissolution or transformation of ω_{iso}. The increase of resistance above 550°C (stage IV) is related to the growth of α-phase particles. The fully reversible character of ω_{ath} growth and dissolution during heating and cooling in the stage I up to 100°C was confirmed by temperature cycling during repeated in situ resistance runs from RT. Pre-ageing of samples at 300°C promotes the formation of ω_{iso} particles. Subsequently, ω_{ath} particles are not created, which is fully consistent with electrical resistance measurements. The presence of ω_{ath} and the orientation relationship between ω and β were identified by the electron diffraction.

Keywords

EN

64.70.kd

Discipline

• 64.70.kd: Metals and alloys

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2015
• Volume: 128
• Issue: 4
• Pages: 779-782

Dates

published

2015-10

Contributors

author

P. Zháňal

• Department of Physics of Materials, Charles University in Prague, Prague, Czech Republic

author

P. Harcuba

• Department of Physics of Materials, Charles University in Prague, Prague, Czech Republic

author

J. Šmilauerová

• Department of Physics of Materials, Charles University in Prague, Prague, Czech Republic

author

J. Stráský

• Department of Physics of Materials, Charles University in Prague, Prague, Czech Republic

author

M. Janeček

• Department of Physics of Materials, Charles University in Prague, Prague, Czech Republic

author

B. Smola

• Department of Physics of Materials, Charles University in Prague, Prague, Czech Republic

author

M. Hájek

• Department of Physics of Materials, Charles University in Prague, Prague, Czech Republic

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Identifiers

DOI

10.12693/APhysPolA.128.779