Effect of Abrasive Medium on Wear Behavior of Al/AlB₂ Functionally Graded Metal Matrix Composite

Abstract

Centrifugal casting process was applied for fabricating the functionally graded Aluminium/10% AlB 2 composite under the centrifuging speed of 1200 rpm and hollow cylindrical (150 × 150 × 15 mm) component has been obtained. The outer, middle and inner surfaces of the FGM those were at the distance of 1 mm, 8 mm and 15 mm from the outer periphery were taken for three body abrasive wear test and the applied load was varied (33 N to 80 N) on these surfaces in the presence of silica sand and alumina as abrasive mediums. The wear test results showed that increase in load and increase in distance from the outer periphery of the FGM increases the wear rate. The surfaces of the FGM abraded with silica sand displays higher wear rate than the surfaces abraded through alumina. SEM analysis has been performed on the surfaces abraded by both medium and it was observed that severity of wear was less in the presence of alumina as abrasive medium during the abrasion test.

Fabrication and characterization of TiB2-reinforced functionally graded aluminum matrix material

“…This is because TiB 2 particles reduce the penetration of abrasive particles on the wear surface by increasing the hardness of the TiB 2 -reinforced region. The reason for the lower wear rates in the TiB 2 -reinforced region can be attributed to the slight wear traces in this region (Kumar et al, 2007;Kumar et al, 2008;Radhika and Raghu, 2016).…”

A review on fabrication and characteristics of functionally graded aluminum matrix composites fabricated by centrifugal casting method

“…Radhika and Raghu [71] reported the wear characteristics of LM25 alloy with 10 wt% (45 µm particle size) AlB 2 reinforcement FGAMC manufactured through horizontal centrifugal casting method. Thereafter, this mixture was poured into the rotating die at 1200 rpm to produce FGAMC.…”

“…Fig 13. Effect of abrasive medium on the wear rate of different zones and hardness variation of FGAMC along the radial direction from the outer periphery[71] …”

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

“…Optik görüntülerde TiB2 partikülleri ile güçlendirimiş bölglerde aşınma izleri daha ince ve yüzeysel iken güçlendirilmemiş bölgelerde daha kalın ve derin olduğu görülmektedir. Şekil 7b'de net bir şekilde görülen derin izler daha çok malzeme kaybına neden olması bekelenirken, Şekil 7c'de görülen ince ve yüzelsel izlarin daha az malzeme kaybına neden olması beklenmektedir(Nachimuthu Radhika & Raghu, 2016) (Niu et al, 2012). Şekil 6'da görüleceği üzere alüminyum matrisli komozitlere göre Al-Cu matrisli kompozitlerin daha az aşındığı görülmektedir.…”