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CSME 2019/12
Volume 40 No.6
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719-726
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Tribological Behavior of Fe-32Mn-6Si Shape Memory Alloys
Amine Charfi a, Mohamed Trabelsi a, Tarak Bouraoui b and Mohamed Kharrat a
aUniversity of Sfax, Laboratory of Electromechanical Systems (LASEM-ENIS), Sfax (Tunisia).
bUniversity of Monastir, Mechanical Engineering Laboratory (LGM-ENIM), Monastir (Tunisia)
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Abstract:
Fe-Mn-Si based Shape Memory Alloys (SMA) present a good mechanical property with a low price compared with Ni-Ti and copper-based alloys, but the development of these alloys is limited to a few areas because of their low corrosion resistance. For this reason, an anticorrosion solution can be used to improve their resistance corrosion by the electrodeposition of a zinc layer followed by a trivalent chromate conversion layer.
Studies on wear behaviours in shape memory alloys are concentrated on Ni–Ti alloys but little studies are interested on Fe–Mn–Si alloys. To be used in industrial applications, the wear performances of shape memory alloys must be determined. This paper will present the wear properties of Fe-32Mn-6Si.
A comparison of the wear behaviour of Fe-32Mn-6Si at its different microstructural states: fully austenitic state (A1), duplex of austenite and thermal martensite state (A2) and finally a mixture of austenite and stress-induced martensite (A3) have been studied using reciprocating ball-on-flat tribometer. The effect of coating layer and the effect of lubrication on the tribological behavior of Fe-32Mn-6Si at its austenitic states were also studied.
The wear tests and the optical micrograph observations of the three microstructures show that the wear mechanism of shape memory alloys depended on the microstructure which was influenced by the amount of martensite presented in material. The wear behaviour of A1 and A2 is almost similar. Nevertheless, the wear resistance of A3 is the better due to the amount of martensite obtained by cooling is limited by the appearance of antiferromagnetism of the austenite structure during cooling. The results show also that the coating of material by an electrolytic zinc layer followed by a chromate conversion layer decreases its wear resistance that related to the formation of a zinc oxide layer that accentuates the wear mechanism. Wear test and optical micrograph show that lubricant improves the friction conditions of shape memory alloys.
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Keywords: Fe-based shape memory alloys, tribological behavior, microstructure.
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©
2019
CSME , ISSN 0257-9731
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