Ti-Ni-Nb-X (Ta and V) Şekil Hatırlamalı Alaşımların Mikroyapısı ve Mikrosertliklerinin Araştırılması

Bu çalışmada hazırlanan Ti-50Ni, Ti-27Ni-23Nb, ve Ti-27Ni-19Nb-4X (Ta ve V) şekil hatırlamalı alaşımlar ark ergitme metodu kullanılarak oluşturuldu. Hazırlanan alaşımların mikrosertlik ve mikroyapıları incelendi. Optik mikroskop ( OM ) ve taramalı elektron mikroskop ( SEM ) görüntüleri, TiNi bazlı şekil hatırlamalı alaşımlara ilave olarak katkılanmış Ta, V ve Nb elementleri ile oda sıcaklığında alınan analizleri ile mikro yapı morfolojilerinde değişiklikler gözlendi. Mikrosertlik sonuçları, şekil hatırlamalı alaşımlara V ve Ta elementleri katkılandığında bu sonuçların değerini artırdığı tespit edilmiştir. Atomikçe eşit olan Ti-Ni ikili şekil hatırlamalı alaşımlarda bulunan mikrosertlik ölçüm sonucu 243 HV olarak bulundu. Bu değer Ti-27Ni-23Nb üçlü şekil hatırlamalı alaşımlar için 354 HV bulundu. Ti-Ni-Nb alaşımına Ta ilavesi ile mikrosertlik değeri yaklaşık 380 HV ye yükselmiştir. Ayrıca, üçlü şekil hatırlamalı alaşıma V elementi katkılanması sonucunda mikrosertlik ölçüm değeri 500 HV olmuştur

Anahtar Kelimeler:

TiNiNbV, TiNiNbTa, Şekil hatırlamalaı alaşımlar, Optik Mikroskop

Investigate of Microhardness and Microstructure of Ti-Ni-Nb-X (Ta and V) Shape Memory Alloys

In this study, based on designed Ti-50Ni, Ti-27Ni-23Nb, and Ti-27Ni-19Nb-4X (Ta and V) SMAs were prepared using arc melting. The microhardness and microstructure of the prepared alloys were examined. The optical microscope (OM) and Scanning Electron Microscopy (SEM) images can be noted that Nb, Ta, and V addition in substitution to nickel causes a change in the microstructure morphology of TiNi Shape Memory Alloy at room temperature. The microhardness results shown that when V and Ta elements were added to SMAs, the microhardness of the alloys was significantly increased. The microhardness value of equal atomic Ti-Ni SMA was found to 243 HV0.3. This value was determined to 354 HV0.3 in the Ti-27Ni-23Nb ternary SMA. By the addition of Ta into the Ti-Ni-Nb alloy, the microhardness value was enhanced to approximately 380HV, additionally, moreover, by adding Vanadium element to the ternary alloy, the microhardness was increased to about 500 HV.

Keywords:

TiNiNbV, TiNiNbTa;, Shape Memory Alloy, Optical Microscope,

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