Effect of Co Addition on the Microstructure, Martensitic Transformation and Shape Memory Behavior of Fe-Mn-Si Alloys

Sujata, M and Bikas C, Maji and Madangopal, Krishnan and Gouthama, - and Ranjit K, Ray (2013) Effect of Co Addition on the Microstructure, Martensitic Transformation and Shape Memory Behavior of Fe-Mn-Si Alloys. The Minerals, Metals & Materials Society and ASM International, 44A (172).

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Abstract

The effect of Co addition has been studied in Fe-30Mn-6Si-xCo (x = 0 to 9 wt pct) shape memory alloys in terms of their microstructure, martensitic transformation and shape recovery. Microstructural investigations reveal that in Fe-Mn-Si-Co alloys, the microstructure remains single-phase austenite (c) up to 5 pct Co and beyond that becomes two-phase comprising c and off-stoichiometric Fe,Co)5Mn3Si2 intermetallic p-phases. The forward c-e martensite transformation start temperature (MS) decreases with the addition of Co up to 5 pct, and alloys containing more than 5 pct Co, show slightly higher MS possibly on account of two-phase microstructure. UnlikeMS, the e-c reverse transformation start temperature (AS) has been found to remain almost unaltered by Co addition. In general, addition of Co to Fe-Mn-Si alloys deteriorates shape recovery due to decreasing resistance to plastic yielding concomitant with the formation of stress induced emartensite. However, there is an improvement in shape recovery beyond 5 pct Co addition, possibly due to the strengthening effect arising from the presence of (Fe,Co)5Mn3Si2 precipitates within the two-phase microstructure and due to higher amount of stress induced e martensite

Item Type: Article
Uncontrolled Keywords: Microstructure, Martensitic
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
CHEMISTRY AND MATERIALS > Metals and Metallic Materials
Depositing User: Users 10 not found.
Date Deposited: 04 Apr 2013 08:44
Last Modified: 11 Aug 2015 06:40
URI: http://nal-ir.nal.res.in/id/eprint/11563

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