An Experimental Study on Abrasive Wear Behavior of Functionally Graded TiB2/Al Composites

Abstract

In this study, it is aimed to produce functionally graded TiB2 reinforced aluminum matrix composites (FG TiB2/Al) materials and to investigate abrasive wear properties. In the production of composites, the reinforcement phase was formed by in-situ technique and the final shapes and functional grading of the composites were done by centrifugal casting technique. Optical, SEM, XRD, hardness and abrasive wear tests were used to investigate the properties of the composites. In this study, abrasive wear tests were performed under three different loads (1, 2 and 3 N), three different speeds (1.5, 3.5 and 5.5 m / s) and 350 grit sandpaper at 100 m distance. As a result of the tests, it was found that the composites had two different regions which are TiB2-rich and TiB2-poor. Abrasive wear properties of TiB2-rich regions were found to be better than TiB2-poor regions.

Keywords

• Abrasive wear
• Functionally graded materials
• In situ TiB2

Fonksiyonel Derecelendirilmiş TiB2/Al Kompozitlerin Abrasif Aşınma Davranışları Üzerine Deneysel Bir Çalışma

Öz

Bu çalışma, Fonksiyonel derecelendirilmiş TiB2 takviyeli alüminyum matrisli kompozitlerin üretimi ve abrasif aşınma özelliklerinin araştırılmasına yöneliktir. Kompozitlerin üretiminde, takviye fazının oluşturulması in-situ tekniği ile yapılmış ve kompozitlerin nihai şekillerinin verilmesi ve fonksiyonel olarak derecelendirilmesi savurma döküm tekniği ile yapılmıştır. Üretilen kompozitlerin özelliklerinin araştırılmasında optik, SEM, XRD, sertlik ve abrasif aşınma testleri kullanılmıştır. Çalışmada abrasif aşınma testleri üç farklı yük (1, 2 ve 3 N), üç farklı hız (1.5, 3.5 ve 5.5 m/s) ve 100 m kayma mesafesinde 350 grid zımpara kağıdı altında yapılmıştır. Yapılan testler sonucunda üretilen kompozitlerin TiB2’ce zengin ve fakir iki farklı bölgeye sahip olduğu görülmüştür. TiB2’ce zengin bölgelerin abrasif aşınma özelliklerinin TiB2’ce fakir bölgelere göre daha iyi olduğu tespit edilmiştir.

Anahtar Kelimeler

• in-situ TiB2
• Abrasif aşınma
• Fonksiyonel derecelendirilmiş malzeme

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