Effects of thermal cycling on the kinetics of the γ → ε martensitic transformation in an Fe-17 wt pct Mn alloy

Variation in kinetics of martensitic transformation, in an equiatomic TiNi shape memory alloy, during thermal cycles was investigated. Samples annealed at 500 °C for 1 hour were subjected to repeated thermal cycles, through the temperature range of martensitic transformation. Unusual 4-stage martensitic transformation during cooling after 30 thermal cycles was observed. Moreover, a new unusual phenomenon was found in the preliminary thermal cycled TiNi alloy. It was observed that variation in the highest temperature Th of thermal cycles temperature interval resulted in the redistribution of released heat among four calorimetric peaks, observed on cooling. It was found that if the Th temperature did not exceed 240 °C the variation in kinetics was repeatable, and determined only by the value of Th. It was assumed that the defect structure induced on preliminary thermal cycling changes reversibly on cooling and heating.

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In situ observation of the martensitic transformation in (Mg,Y)-PSZ

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100144036 ◽

1986 ◽

Vol 44 ◽

pp. 500-501

Author(s):

R-R. Lee

Keyword(s):

Martensitic Transformation ◽

High Strength ◽

Nucleation And Growth ◽

In Situ Observation ◽

Considerable Potential ◽

Transmission Electron ◽

Structural Applications ◽

Applied Stresses ◽

Kinetics Of

Partially-stabilized ZrO2 (PSZ) ceramics have considerable potential for advanced structural applications because of their high strength and toughness. These properties derive from small tetragonal ZrO2 (t-ZrO2) precipitates in a cubic (c) ZrO2 matrix, which transform martensitically to monoclinic (m) symmetry under applied stresses. The kinetics of the martensitic transformation is believed to be nucleation controlled and the nucleation is always stress induced. In situ observation of the martensitic transformation using transmission electron microscopy provides considerable information about the nucleation and growth aspects of the transformation.

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The kinetics of lath martensitic transformation

Journal de Physique IV (Proceedings) ◽

10.1051/jp4:2003851 ◽

2003 ◽

Vol 112 ◽

pp. 139-142 ◽

Cited By ~ 4

Author(s):

G. Ghosh ◽

G. B. Olson

Keyword(s):

Martensitic Transformation ◽

Kinetics Of

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Effect of Thermocycling on the Structure of Martensite and Kinetics of Martensitic Transformation in Alloy Fe – 30% Ni – 3% Pd

Metal Science and Heat Treatment ◽

10.1007/s11041-017-0163-4 ◽

2017 ◽

Vol 59 (7-8) ◽

pp. 407-409 ◽

Cited By ~ 3

Author(s):

Yasin Gokturk Yildiz ◽

Gokcen Dikici Yildiz

Keyword(s):

Martensitic Transformation ◽

Kinetics Of

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Influence of thermal cycling on the reversible martensitic transformation in a Cu-Al-Ni shape memory alloy

Materials Science and Engineering A ◽

10.1016/0921-5093(94)09686-4 ◽

1995 ◽

Vol 196 (1-2) ◽

pp. 177-181 ◽

Cited By ~ 10

Author(s):

M. Morin ◽

F. Trivero

Keyword(s):

Martensitic Transformation ◽

Shape Memory Alloy ◽

Thermal Cycling ◽

Shape Memory

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An Interpretation on Kinetics of Martensitic Transformation

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.172-174.90 ◽

2011 ◽

Vol 172-174 ◽

pp. 90-98 ◽

Cited By ~ 1

Author(s):

Tomoyuki Kakeshita ◽

Takashi Fukuda ◽

Yong-Hee Lee

Keyword(s):

Magnetic Field ◽

Hydrostatic Pressure ◽

Martensitic Transformation ◽

Magnetic Fields ◽

Martensitic Transformations ◽

Phenomenological Theory ◽

Time Dependent ◽

Isothermal Process ◽

Kinetics Of ◽

Transformation Processes

We have investigated athermal and isothermal martensitic transformations (typical displacive transformations) in Fe–Ni, Fe–Ni–Cr, and Ni-Co-Mn-In alloys under magnetic fields and hydrostatic pressures in order to understand the time-dependent nature of martensitic transformation, that is, the kinetics of martensitic transformation. We have confirmed that the two transformation processes are closely related to each other, that is, the athermal process changes to the isothermal process and the isothermal process changes to the athermal one under a hydrostatic pressure or a magnetic field. These findings can be explained by the phenomenological theory, which gives a unified explanation for the two transformation processes previously proposed by our group.

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