Mekanik alasımlama yöntemi ile niyobyum ilaveli cualni sekil hafızalı alasımların üretimi karakterizasyonu ve asınma performanslarının incelenmesi
Küçük Resim Yok
Tarih
2019
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Karabük Üniversitesi
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Bu çalı?mada, Cu14Al4Ni ala?ımının farklı miktarlarda Nb ilave edilerek, Nb miktarının a?ınma davranı?ı üzerine etkileri incelenmi?tir. Çalı?manın ilk a?amasında, mekanik ala?ımlama ile üretilen Cu14Al4Ni ala?ımında, farklı mekanik ala?ımlama sürelerinin ala?ımın toz boyutu üzerindeki etkisi ara?tırılmı?tır. Üretilen ala?ım tozları, soğuk pres ile ?ekillendirilerek sinterlenmi?tir. Sinterlenen ala?ımlar 900 °C 1 saat ısıl i?lem yapıldıktan sonra suda hızlı soğutulmu?tur. Üretilen Cu14Al4Ni ala?ımları yoğunluk, sertlik, toz boyut analizi ve a?ınma testleri yapılmı?tır. Ayrıca üretilen ala?ımların, termal analizleri; (DTA/DSC), x-ı?ını kırınımı (XRD) ve mikroyapı incelemeleri (SEM+EDS) yapılmı?tır. Krakterizasyon çalı?maları tamamlandıktan sonra pin-on-disk tipi a?ınma cihazında, a?ınma testleri yapılmı?tır.A?ınma testlerinde üç farklı yük, be? farklı kayma mesafesi ve 1 ms-1 kayma hızı test edilmi?tir. Çalı?manın ikinci a?amasında ise, Cu14Al4Ni ala?ımına farklı miktarlarda Nb ilave edilerek, yeni ala?ım sistemeleri elde edilmi?tir. Üretilen ala?ım tozları soğuk preslendikten sonra iki saat sinterlenmi?tir. Sinterleme iv i?leminden sonra ala?ımlar 900 °C 1 saat süre ısıl i?lem uygulanarak suda hızlı soğutulmu?tur. Yapılan çalı?malar sonucunda Cu14Al4Ni ala?ımlarında mekanik ala?ımlama süresi arttıkça toz boyutunun azaldığı belirlenmi?tir. Yük miktarındaki artı? kütle kaybını atırmaktadır. Kütle kaybı Nb ilavesi arttıkça azaldığı görülmü?tür. A?ınma oranlarıda artan Nb oranı ile azalma göstermi?tir. Anahtar Sözcükler: ?ekil hafızalı ala?ım, a?ınma performansı, toz metalurjisi, mekanik ala?ımlama, Cu-Al-Ni Bilim Kodu : 701.3.019
In this study, Cu14Al4Ni alloy, one of the shape memory alloys, was produced by mechanical alloying at different times and the abrasion performances were investigated. In the first stage of the study, the effect of different mechanical alloying times on the powder size of the alloy was determined in Cu14Al4Ni alloy produced by mechanical alloying. The alloy powders produced were sintered by forming with cold press. The sintered alloys were cooled rapidly at 900 ° C after 1 hour of heat treatment. Cu14Al4Ni alloys produced density, hardness, powder size analysis and abrasion tests were performed. Alloys produced were also analyzed by thermal analysis (DTA/DSC), x-ray diffraction (XRD) and microstructure studies (SEM+EDS). After the completion of the crackerization studies, wear tests were carried out on the pin-on-disc type wear device. As a result of the studies, it was determined that the powder size decreases with increasing mechanical alloying time in Cu14Al4Ni alloys. vi In the second stage of the study, mechanical alloying (MA) time was determined as 7.5 hours. New alloy systems were obtained by adding different amounts of Nb to Cu14Al4Ni alloy. The alloy powders were sintered for two hours after cold pressing. After sintering, the alloy was cooled rapidly by heat treatment with 900 °C for 1 hour. The increase in load amount increases the mass loss. It was observed that mass loss decreased as Nb addition increased. Wear rates also decreased with increasing Nb ratio. Key Word : Shape memory alloys, mechanical alloying, wear behavior, powder metallurgy, Cu-Al-Ni. Science Code : 701.3.019
In this study, Cu14Al4Ni alloy, one of the shape memory alloys, was produced by mechanical alloying at different times and the abrasion performances were investigated. In the first stage of the study, the effect of different mechanical alloying times on the powder size of the alloy was determined in Cu14Al4Ni alloy produced by mechanical alloying. The alloy powders produced were sintered by forming with cold press. The sintered alloys were cooled rapidly at 900 ° C after 1 hour of heat treatment. Cu14Al4Ni alloys produced density, hardness, powder size analysis and abrasion tests were performed. Alloys produced were also analyzed by thermal analysis (DTA/DSC), x-ray diffraction (XRD) and microstructure studies (SEM+EDS). After the completion of the crackerization studies, wear tests were carried out on the pin-on-disc type wear device. As a result of the studies, it was determined that the powder size decreases with increasing mechanical alloying time in Cu14Al4Ni alloys. vi In the second stage of the study, mechanical alloying (MA) time was determined as 7.5 hours. New alloy systems were obtained by adding different amounts of Nb to Cu14Al4Ni alloy. The alloy powders were sintered for two hours after cold pressing. After sintering, the alloy was cooled rapidly by heat treatment with 900 °C for 1 hour. The increase in load amount increases the mass loss. It was observed that mass loss decreased as Nb addition increased. Wear rates also decreased with increasing Nb ratio. Key Word : Shape memory alloys, mechanical alloying, wear behavior, powder metallurgy, Cu-Al-Ni. Science Code : 701.3.019
Açıklama
Fen Bilimleri Enstitüsü, Metal Eğitimi Ana Bilim Dalı
Anahtar Kelimeler
Metalurji Mühendisliği, Metallurgical Engineering
