OPTIMIZATION OF SHAPE MEMORY EFFECT IN FE-BASED SHAPE MEMORY ALLOYS BY MODIFICATION OF SOLUTION TREATMENT TEMPERATURE
El Fawkhry, M., Sampath, V., Mattar, T. (2018). OPTIMIZATION OF SHAPE MEMORY EFFECT IN FE-BASED SHAPE MEMORY ALLOYS BY MODIFICATION OF SOLUTION TREATMENT TEMPERATURE. EKB Journal Management System, 18(18th International Conference on Applied Mechanics and Mechanical Engineering.), 1-9. doi: 10.21608/amme.2018.34964
M. K. El Fawkhry; V. Sampath; T. Mattar. "OPTIMIZATION OF SHAPE MEMORY EFFECT IN FE-BASED SHAPE MEMORY ALLOYS BY MODIFICATION OF SOLUTION TREATMENT TEMPERATURE". EKB Journal Management System, 18, 18th International Conference on Applied Mechanics and Mechanical Engineering., 2018, 1-9. doi: 10.21608/amme.2018.34964
El Fawkhry, M., Sampath, V., Mattar, T. (2018). 'OPTIMIZATION OF SHAPE MEMORY EFFECT IN FE-BASED SHAPE MEMORY ALLOYS BY MODIFICATION OF SOLUTION TREATMENT TEMPERATURE', EKB Journal Management System, 18(18th International Conference on Applied Mechanics and Mechanical Engineering.), pp. 1-9. doi: 10.21608/amme.2018.34964
El Fawkhry, M., Sampath, V., Mattar, T. OPTIMIZATION OF SHAPE MEMORY EFFECT IN FE-BASED SHAPE MEMORY ALLOYS BY MODIFICATION OF SOLUTION TREATMENT TEMPERATURE. EKB Journal Management System, 2018; 18(18th International Conference on Applied Mechanics and Mechanical Engineering.): 1-9. doi: 10.21608/amme.2018.34964

OPTIMIZATION OF SHAPE MEMORY EFFECT IN FE-BASED SHAPE MEMORY ALLOYS BY MODIFICATION OF SOLUTION TREATMENT TEMPERATURE

The International Conference on Applied Mechanics and Mechanical Engineering
Article 28, Volume 18, 18th International Conference on Applied Mechanics and Mechanical Engineering., April 2018, Page 1-9  XML PDF (7.64 MB)
Document Type: Original Article
DOI: 10.21608/amme.2018.34964
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Authors
M. K. El Fawkhry1, 2; V. Sampath3; T. Mattar4
1Central Metallurgical and Research and Development Institute (CMRDI), Cairo, Egypt.+
2corresponding author.
3Department of Metallurgical and Materials Engineering, Indian Institute of
4Central Metallurgical and Research and Development Institute (CMRDI), Cairo, Egypt.
Abstract
ABSTRACT
Solution treatment is an important process parameter in the context of thermo
mechanical processing of shape memory alloys. It is one of the preliminary steps that
is required to obtain martensite in the alloys. As far as martensite is concerned, it
forms the basis of shape memory effect as shape memory alloys are used
capitalizing on their unique properties of shape memory effect and superelastic
effect. It is well known that the grain size of austenite in the solutionized condition
depends on the austenitizing/solutionizing temperature. Moreover, the solution
treatment temperature influences the transformation temperatures of SMAS. It has
been found by researchers that solutionizing temperature brings about modification in
the grain size, the grain boundary angles, and the annealing twins. The major
objective of the present work is to assess the influence of modifications in the
microstructural features brought about increasing/decreasing the solution treatment
temperature. Optical microscopic and back scattered electron diffraction studies
reveal the microstructural changes brought about by changing the solutionizing
temperature. The X-ray diffraction experiments reveal the increase in SIEM in the
alloy that was solution treated at 800, 900, 1000°C.
The TEM studies reveal the formation of stacking faults and their interaction with one
another and also with the grain boundaries. The results indicate that solutionizing at
an optimal temperature of 1000°C leads to increased shape recovery strain as well
as shape recovery stress. The results are presented and discussed in the paper.
Keywords
shape memory alloy; Iron based shape memory alloy; Solution treatment; Shape memory effect; Stress recovery
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