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

Öz

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.

Anahtar Kelimeler

• 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

Öz

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.    

Anahtar Kelimeler

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

Kaynakça

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