Heat Treatment and Dynamic Mechanical Analysis Strain Sweep Effects on the Phase Structure and Morphology of an Fe-28Mn-6Si-5Cr Shape Memory Alloy

Author:

Popa Mihai1ORCID,Popa Florin2ORCID,Pricop Bogdan1ORCID,Cimpoeșu Nicanor1,Lohan Nicoleta-Monica1ORCID,Kicsi Gabriel1,Istrate Bogdan3ORCID,Bujoreanu Leandru-Gheorghe1ORCID

Affiliation:

1. Faculty of Materials Science and Engineering, “Gheorghe Asachi” Technical University of Iași, Blvd. Dimitrie Mangeron 71A, 700050 Iași, Romania

2. Faculty of Materials and Environmental Engineering, Technical University from Cluj-Napoca, Blvd. Muncii, No. 103-105, 400641 Cluj-Napoca, Romania

3. Faculty of Mechanical Engineering, “Gheorghe Asachi” Technical University of Iasi-Romania, Blvd. Dimitrie Mangeron, No. 61-63, 700050 Iași, Romania

Abstract

Fe-Mn-Si-based shape memory alloys (SMAs) have been extensively investigated since 1982 for various useful properties that enhance the development of different applications such as anti-seismic dampers for very tall buildings, pipe joints, or rail fasteners. In particular, the Fe-28Mn-6Si-5Cr (mass. %) alloy has been mainly used in vibration mitigation or self-adjustable axial displacement applications. Dynamic mechanical analysis (DMA), performed by strain sweeps (SS), enables the monitoring of the evolution of storage modulus and internal friction variations with increasing strain amplitudes at different constant frequencies and temperatures. Thus, applying dynamic bending with various frequencies and amplitudes that actually represents an isothermal mechanical treatment. In the present paper, an Fe-28Mn-6 Si-5Cr (mass. %) SMA was cast by ingot metallurgy, hot-rolled, and water quenched in order to obtain thermally induced martensite and avoid the occurrence of cooling cracks. The influence of the holding time, between 2 and 10 h, at 1050 °C and the effects of DMA-SS performed at three different frequencies were analyzed by a differential scanning calorimetry, an X-ray diffraction, and a scanning electron and atomic force microscopy. The effects of the holding time and mechanical treatment on the structure and morphology of martensite plates were corroborated with the results of the thermal analysis.

Publisher

MDPI AG

Subject

General Materials Science,General Chemical Engineering

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