Mn İçeriğinin Mn50-xNi41+xSn9 (x = 0, 2, 4) Manyetik Şekil Hafızalı Alaşımlarının Termal ve Manyetik Özelliklerine Etkisi

Year 2019, Volume: 23 Issue: 1, 15 - 19, 01.04.2019

Merivan Şaşmaz

https://doi.org/10.19113/sdufenbed.450724

Cited By: 3

Abstract

Manyetik şekil hafızalı alaşımlarda (MŞHA) martensitik dönüşüm
sıcaklıkları ve manyetik özellikler, alaşımı oluşturan metallerin
kompozisyonuna güçlü bir şekilde bağlıdır. NiMn temelli MŞHA’ da yüksek Mn
içeriğinin martensitik dönüşüm sıcaklıkları ve manyetizasyon değerleri üzerine
etkisi önem taşımaktadır. Bu çalışmada, Mn_50-xNi_41+xSn₉  (x = 0, 2, 4) MŞHA’ da yüksek Mn içeriğinin
termal ve manyetik özelliklere etkisi rapor edildi. Alaşımlar indüksiyon
eritme/döküm metodu ile hazırlandı ve 72 saat 900 ^oC’ de argon
atmosferinde ısıl işleme maruz kaldı ve daha sonra suda ani soğutuldu.
Hazırlanan malzemelerin martensitik dönüşüm sıcaklıkları ve sıcaklığa bağlı
manyetizasyon ölçümleri diferansiyel taramalı kalorimetresi (DSC) ve titreşimli
örnek manyetometresi (VSM) ile yapıldı. Sonuç
olarak DSC ölçümleri ve termomanyetizasyon (M-T) eğrilerinden, Mn içeriğinin alaşımların
martensitik dönüşüm sıcaklıkları ve manyetizasyon değerlerini değiştirdiği tespit
edildi. Mn miktarı artışına bağlı olarak martensitik dönüşüm sıcaklıklarında
azalma ve bu sıcaklıklardaki manyetizasyon değerlerinde ani atlayışlar görüldü.
Ayrıca manyetizasyon değerlerinde de Mn miktarı düştükçe azalma gözlendi.

Keywords

MnNiSn, Manyetik şekil hafızalı alaşımlar, DSC, VSM, Termomanyetizasyon

The Effect of Mn Content on Thermal and Magnetic Properties of Mn50-xNi41+xSn9 (x = 0, 2, 4) Magnetic Shape Memory Alloys

Abstract

In magnetic
shape memory alloys (MSMA), martensitic transformation temperatures and
magnetic properties are strongly correlated with the composition of compounds.
High Mn concentration in NiMn based MSMA has important effects on martensitic transformation
temperatures and magnetization values. In this study, it was reported that the
effect of Mn content on thermal and magnetic properties of Mn_50-xNi_41+xSn₉
(x = 0, 2, 4) MSMA. Considered alloys were prepared by an induction
melting/casting method, and they were heat treated at 900 ^oC for 72
hours in argon atmosphere and then quenched into water. Prepared materials’
martensitic transformation temperatures and temperature-dependent magnetization
measurements were done by differential scanning calorimetry (DSC) and vibrating
sample magnetometer (VSM). As a result, it was determined that Mn content
changed the martensitic transformation temperatures and magnetization values of
alloys by DSC measurements and thermomagnetization (M-T) curves. Depending on
the amount of Mn, it was seen that increment of martensitic transformation
temperatures and sudden jump magnetization at these temperatures. Also, the
magnetization values decreased as the Mn content decreased.    

Keywords

MnNiSn, Magnetic shape memory alloys, DSC, VSM, Thermomagnetization

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