Mechanical and Microstructural Properties of Ti-V-Al High Temperature Shape Memory Alloy

Abstract

The phase transformation, microstructural and mechanical properties of Ti-15V-2Al high temperature shape memory alloy produced with arc-melting method were investigated by DSC, XRD, SEM and high temperature micro-indenter system. The reverse martensitic transformation As starting and Af finishing temperatures of alloy were obtained to be 195 °C and 285 °C, respectively. In high temperature microindentation analysis, the alloy were subjected to indentation tests under 5000 mN load for three different temperatures (24 °C, 250 °C and 450 °C). The hardness and reduced elastic modulus values of the alloy at room temperature (24 °C ), that is, martensite structure, were found to be higher than the values at 450 °C, that is, austenite structure. The effect of temperature on superelasticity was examined and it was found that the superelasticity value of the alloy was higher at 450 °C compared to its value at 24 °C.

Keywords

• Shape Memory Alloys
• High Temperature
• Mechanical Properties
• Ti-Based Alloys
• Superelasticity

Ti-V-Al Yüksek Sıcaklık Şekil Hafızalı Alaşımın Mekaniksel ve Mikroyapısal Özellikleri

Öz

Ark eritme yöntemiyle üretilen Ti-15V-2Al yüksek sıcaklıklı şekil hafızalı alaşımın faz dönüşümü, mikroyapısal ve mekaniksel özellikleri DSC, XRD, SEM ve yüksek sıcaklık mikro çentme sistemi ile incelenmiştir. Alaşımın ters martensitik dönüşüm As başlangıç ve Af bitiş sıcaklıkları sırasıyla 195 °C ve 285 °C olarak elde edilmiştir. Yüksek sıcaklık mikro çentme analizlerinde, alaşım üç farklı sıcaklıkta (24°C, 250 °C ve 450 °C) 5000 mN yük altında çentik testlerine tabi tutulmuştur. Alaşımın oda sıcaklığında (24 °C) yani martensit yapısındaki sertlik ve elastik modül değerlerinin, 450 °C'deki yani östenit yapısındaki değerlerden daha yüksek olduğu tespit edilmiştir. Sıcaklığın süperelastisiteye etkisi incelenmiş ve alaşımın 450 °C'deki süperelastisite değerinin daha yüksek olduğu bulunmuştur.

Anahtar Kelimeler

• Şekil Hafızalı Alaşım
• Yüksek Sıcaklık
• Mekaniksel Özellikler
• Ti-Temelli Alaşımlar
• Süperelastisite

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