Wear Behaviors of NiTi+Lax (x:1, 3, 5 wt. %) Alloys Produced via M/A, P/M and Boro-Sintering Techniques

Öz

The powder Metallurgy (P/M) method is mainly preferred in the production of superior metal alloys that cannot be produced with traditional methods. In this study, the first step was mechanical alloying (M/A) of NiTi+Lax powders via ball milling. Then the alloyed powders were pressed and gradually sintered using airtight ceramic crucibles filled with boron salt (for alloying and creating an atmospheric environment) to obtain NiTi+Lax alloys. The wear properties and behaviors of the samples were determined (with different La amounts (1wt.%, 3wt.%, and 5wt.%)) by pin-on-disc testing. The experiments were carried out at a sliding speed of 1.2 m/s and under 5N, 10N, and 15N loads. The microstructures of the worn surfaces were characterized by FESEM and the distribution of elements was analyzed by EDS. As a result, the lowest friction coefficient and wear loss were observed in the NiTi+Lax alloy containing 1wt.% La. The amount of wear volume increased with the increase in load and La content.

Anahtar Kelimeler

• NiTi+Lax Alloys
• Boro-Sintering of NiTi-La Alloys
• Wear Behaviour of NiTi+Lax Alloys
• Powder Metallurgy (P/M)
• Mechanical Alloying (M/A)

Destekleyen Kurum

PAMUKKALE ÜNİVERSİTESİ

Proje Numarası

2022FEBE025

M/A, T/M ve Boro-Sinterleme Teknikleriyle Üretilen NiTi+Lax (x:1, 3, 5 ağırlık %) Alaşımlarının Aşınma Davranışları

Öz

Toz Metalurjisi (T/M) yöntemi, geleneksel yöntemlerle üretilemeyen üstün metal alaşımlarının üretiminde çoğunlukla tercih edilmektedir. Bu çalışmada, ilk adım NiTi+Lax tozlarının bilyalı öğütme yoluyla mekanik alaşımlanması (M/A) olmuştur. Daha sonra alaşımlı tozlar preslenmiş ve bor tuzu ile doldurulmuş hava geçirmez seramik potalarda (alaşımlama ve atmosferik ortam oluşturmak için) kademeli olarak sinterlenerek NiTi+Lax alaşımları elde edilmiştir. Numunelerin aşınma özellikleri ve davranışları (farklı La miktarlarıyla (x: 1,3,5 % ağ.)) disk üstü pim testi ile belirlenmiştir. Deneyler 1,2 m/s kayma hızında ve 5N, 10N ve 15N yükler altında gerçekleştirilmiştir. Aşınmış yüzeylerin mikro yapıları FESEM ile karakterize edilmiş ve elementlerin dağılımı EDS ile analiz edilmiştir. Sonuç olarak, en düşük sürtünme katsayısı ve aşınma kaybı ağırlıkça %1 La içeren NiTi+Lax alaşımında gözlemlenmiştir. Aşınma hacmi miktarı yük ve La içeriğindeki artış ile artmıştır.

Anahtar Kelimeler

• NiTi+Lax Alaşımları
• NiTi-La Alaşımlarının Boro-Sinterlenmesi
• NiTi+Lax Alaşımlarının Aşınma Davranışı
• Toz Metalurjisi (T/M)
• Mekanik Alaşımlama (M/A)

Proje Numarası

2022FEBE025

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