Toz metalurjisi ile Üretilen NiTi Alaşımına Al’un Etkisi

Bu çalışmada, Ti-50,5Ni-xAl(x=0, 2, 4) alaşımı toz metalürjisi yöntemlerinden SHS ile üretildi. Üretilen NiTiAlalaşımlarında Al oranının numunelerin mikroyapılarına ve mikrosertliklerine etkileri detaylı bir şekilde incelendi.Mikroyapı analizleri optik mikroskobu(OM) ve taramalı elektron mikroskobu (SEM) ile faz bileşenleri ise EnerjiDağılımlı Spektroskopi (EDX) ve X-Işınları Kırınım Cihazı (XRD) analizi ile tespit edildi. Sertlik ölçüm testleriVickers (Hv) mikrosertlik ölçüm cihazında yapılmıştır. Ateşleme sonrası ekzotermik reaksiyon sonucundabaşlayan yanma reaksiyonu esnasında yüzeyde oluşan sıcaklık değişimi lazer sıcaklık ölçüm cihaz ile tespit edildi.Optik mikroskop(OM) analizleri sonucunda Al içeriğinin artmasına bağlı olarak gözenek oranın arttığıgözlenmektedir. Ayrıca Al ilavesiz NiTi numunesinde ise yanma kanallarının yoğun olduğu görüldü. Hem EDXhem de XRD anliz sonuçlarında alaşımlarda NiTi, NiTi2 ve Ti3Al fazlarının varlığı tespit edildi. Yüzey sıcaklıkölçüm sonuçlarında yanma reaksiyonu en düşük 550℃ elde edilirken en yüksek ise 1250℃ ölçüldü. Mikrosertlikölçüm sonuçlarında en düşük sertlik değeri 176.8 HV0,5 ağ. %4 Al numunesinden elde edilirken, en yüksek değerise 301.7 HV0,5 NiTi numunesinde ölçüldü.

The Effect of Al of NiTi Alloy Fabricated by Powder Metallurgy

In this study, Ti-50,5Ni-xAl (x=0, 2, 4) alloy is produced by SHS which is one of the powder metallurgy methods. The effects of Al ratios on the microstructure and microhardness of the samples in the produced NiTiAl alloys are examined in detail. The analysis of microstructure is determined by optical microscope and scanning electron microscope (SEM) and phase components are analysed by Energy Dispersive spectroscopy (EDX) and X-Ray Diffraction Device (XRD). The measurement tests of hardness are carried out by using Vickers (Hv) microhardness test device. The temperature change on the surface during the combustion reaction which started as a result of the exothermic reaction after ignition is measured by a laser temperature measuring device. Based on the results of optical microscope (OM) analysis, the pore ratio has increase with the increase ratio of Al content. Moreover, it is observed that the combustion channels are intense fort he NiTi sample without Al content. At both of the results of EDX and XRD analysis, it has been noticed the presence of NiTi, NiTi2 ve Ti3Al phases in the alloys. In surface temperature measurement results, the lowest 550 ℃ combustion reaction was obtained, while the highest 1250 ℃ was measured. For the microhardness measurement results, the lowest value is observed as 176.8 HV0,5 from the %4 Al alloy samples while the highest value is measured 301.7 HV0,5 from NiTi sample.

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