Strain-Rate-Dependent Thermo-Microstructural Evolution in Fe-Mn-Si Shape Memory Alloys Under Cyclic Tensile Training Process
Qian Sun, Bo Cao, Takeshi Iwamoto
TL;DR
This study explores how strain rate affects the thermal and microstructural changes in Fe-Mn-Si shape memory alloys during cyclic loading.
Contribution
The paper reveals how strain rate influences transformation enthalpy, driving force, and martensite evolution in Fe-Mn-Si alloys.
Findings
Impact loading increases transformation enthalpy more rapidly than quasi-static loading.
Impact-trained samples show faster internal stress and dislocation accumulation, promoting martensite formation.
EBSD analysis shows impact loading reduces interface resistance and enhances shape recovery.
Abstract
Iron-based shape memory alloys (Fe-SMAs) are promising for structural retrofitting because of their low cost, corrosion resistance, and manufacturability. However, the effect of strain rate on the coupled thermo-microstructural evolution during cyclic training remains underexplored. In this study, samples underwent cyclic tensile training at quasi-static and impact strain rates. After each cycle, DSC was adopted to obtain transformation temperatures and enthalpies, and selected cycles were characterized by EBSD (KAM and IPF) to quantify phase fractions and variant statistics. Results show tensile loading shifts transformation temperatures, with the principal difference between regimes appearing in the evolution of martensite finish temperature. Under impact loading, the transformation enthalpy increases more rapidly (0.18 to 0.8 J/g in absolute value), and the driving force decreases…
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Taxonomy
TopicsShape Memory Alloy Transformations · Microstructure and Mechanical Properties of Steels · Metallic Glasses and Amorphous Alloys