Toz metalurjisi ile Üretilen NiTi Alaşımına Al'un Etkisi

Year 2021, , 256 - 267, 21.03.2021

Musa Kılıç

https://doi.org/10.17798/bitlisfen.841400

Cited By: 2

Abstract

Bu çalışmada, Ti-50,5Ni-xAl(x=0, 2, 4) alaşımı toz metalürjisi yöntemlerinden SHS ile üretildi. Üretilen NiTiAl alaşımlarında Al oranının numunelerin mikroyapılarına ve mikrosertliklerine etkileri detaylı bir şekilde incelendi. Mikroyapı analizleri optik mikroskobu ve taramalı elektron mikroskobu (SEM) ile, faz bileşenleri ise Enerji dağılımlı spektroskopi (EDX) ve X-Işınları Kırınım Cihazı (XRD) analizi ile tespit edildi. Sertlik ölçüm testleri Vickers (Hv) mikrosertlik ölçüm cihazında yapılmıştır. Ateşleme sonrası ekzotermik reaksiyon sonucunda başlayan 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 oranı arttı. Ayrıca Al ilavesiz NiTi numunesinde ise yanma kanallarının yoğun olduğu görüldü. Hem EDX hem de XRD anliz sonuçlarında alaşımlarda NiTi, NiTi2 ve Ti3Al fazlarının varlığı tespit edildi. Yüzey sıcaklık ölçüm sonuçlarında yanma reaksiyonu en düşük elde edilirken 550℃ en yüksek 1250 ℃ ölçüldü. Mikrosertlik ölçüm sonuçlarında en düşük sertlik değeri 176.8 HV0,1 ağ. %4 Al numunesinden elde edilirken, en yüksek değer ise 301.7 HV NiTi numunesinde ölçüldü.

Keywords

Ni-Ti-Al, NiTi-Al, Mikroyapı, Gözeneklilik, Yanma reaksiyonu

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