Investigation of Phase Transformation Temperature, Corrosion Resistance and Structural Properties of Ti-27Ni-20Nb-3V Shape Memory Alloy

Abstract

In this study Ti-27Ni-20Nb-3V (% at.) alloy was produced by arc- melting method. After the produced alloy was homogenized at 850 ℃ for 24 hours, its pysical and chemical properties such as phase transformation temperatures, micro-structure, electro chemical wear resistance, microhardness were investigated. Phase transformation temperatures were determined with the help of DSC that autenite-martensite phase transitions were below room temperature. In optical microscope (OM) and SEM images, -Nb, B2 ve B19/ were found in XRD pattern, where the alloy is composed of dendritic structure. In addition, as a result of the calculations, the crystallite particle size was calculated as approximately 39,65 nm. Corrosion resistance was calculated as 8,09x10-5 mmpy as a result of electrochemical analysis performed in SBF (artificial body fluid) at room temperature. In microhardness measurements, the microhardness of the alloys was taken from five different regions and found to be 810 HV on average.

Keywords

• Shape memory alloy
• corrosion resistance
• microhardness

Project Number

119M300

Ti-27Ni-20Nb-3V Alaşımın Faz Dönüşüm Sıcaklıkları, Korozyon Direnci ve Yapısal Özelliklerinin İncelenmesi

Abstract

Bu çalışmada Ti-27Ni-20Nb-3V (% at.) alaşımı ark-ergitme yöntemi ile üretildi. Üretilen alaşım 850 ℃ de 24 saat homojenleştirildikten sonra, faz dönüşüm sıcaklıkları, mikro-yapısı, elektrokimyasal aşınma direnci, mikrosertlik gibi fiziksel ve kimyasal özellikleri araştırıldı. DSC yardımıyla faz dönüşüm sıcaklıkları austenite-martensite faz geçişlerinin oda sıcaklığının altında olduğu belirlendi. Optik mikroskop (OM) ve SEM görüntülerinde alaşımın dentrik yapıdan oluştuğu, XRD patterninde -Nb, B2 ve B19/ piklerine rastlandı. Ayrıca, yapılan hesaplamalar sonucu kristalit tane boyutu yaklaşık 39,65 nm olarak hesaplandı. Oda sıcaklığında SBF’de (yapay vücut sıvısı) yapılan elektrokimyasal analizi sonucu korozyon direnci 8,09x10-5 mmpy olarak hesaplandı. Mikrosertlik ölçümlerinde alaşımın mikrosertliği beş ayrı bölgeden alınarak ortalama 810 HV olarak bulundu.

Keywords

• Şekil hatırlamalı alaşım
• korozyon direnci
• mikrosertlik

Supporting Institution

tubitak

Project Number

119M300

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