Yeni CuAlCrMg Yüksek Sıcaklık Şekil Hafızalı Alaşımının (YSŞHA) Termal, Yapısal ve Manyetik Karakterizasyonu

Yıl 2022, Cilt: 34 Sayı: 2, 161 - 170, 30.09.2022

Güneş Başbağ , Oktay Karaduman , Mustafa Boyrazlı , İskender Özkul , Canan Aksu Canbay

Öz

Fonksiyonel malzemeler arasında şekil hafızalı alaşımların (ŞHA) kullanım şekline göre endüstride değişen talepler ortaya çıkmıştır. Bu talepler bu çok yönlü akıllı alaşımların maliyetini düşürmek veya performanslarını arttırmak ve özelliklerini değiştirmek şeklinde olabilir. Bu çalışmada, bakır bakımından zengin ve yeni ve benzersiz 73.33Cu-21.85Al-4.26Cr-0.56Mg (at.%) kimyasal kompozisyonuna sahip CuAlCrMg yüksek sıcaklık şekil hafızalı alaşımı (YSŞHA) ark eritme yöntemi kullanılarak külçe halinde dökümü yapılarak üretilmiştir. Elde edilen külçe alaşımından küçük numuneler kesilerek yüksek sıcaklıkta homojenize edilmiş ve tuzlu-buzlu suda söndürme işlemi yapılarak alaşıma şekil hafıza etkisi özelliği kazandırılmıştır. Alaşımın; termal şekil hafıza etkisi karakterizasyonu diferansiyel kalorimetri (DSC ve DTA) ölçümleri ile, kimyasal kompozisyon analizi enerji dağılım x-ışını (EDX) ölçümü ile, yapısal martensit fazları x-ışını difraksiyonu (XRD) testi ile ve manyetik özellikleri de titreşimli numune manyetometresi (VSM) ölçümü ile yapılarak incelenmiştir. DSC ve DTA ölçüm sonuçlarında (termogramlarda) alaşımdaki şekil hafıza etkisi özelliğinin varlığına işaret eden direkt ve ters martensitik faz dönüşümlerinin oluştuğunu gösteren pikler gözlenmiştir. XRD difraksiyon deseninde martensit fazlarına ait piklerin oluştuğu görülmüştür. VSM ölçümü alaşımın paramanyetik olduğunu göstermiştir. Bu çalışmada üretilen yeni bakır bazlı CuAlCrMg yüksek sıcaklık şekil hafızalı alaşımı literatüre dahil edilerek yüksek sıcaklık şekil hafızalı alaşımlarla ilgili uygulamalarda fayda sağlayabilir.

Anahtar Kelimeler

Yüksek sıcaklık şekil hafızalı alaşım (YSŞHA), CuAlCrMg alaşımı, Diferansiyel kalorimetri, XRD, Optik mikroskobi, Martensitik dönüşüm, VSM., Diferansiyel kalorimetri, XRD, Optik mikroskobi, Martensitik dönüşüm, VSM.

Kaynakça

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