Yeni ZK60 SiC/AlN takviyeli kompozitlerin mikroyapı karakterizasyonu ve aşınma özellikleri

Yıl 2026, Cilt: 32 Sayı: 2

Khaled Saleh Aldoukali Matoug İsmail Esen , Abdulmuaen Mm Sager Hayrettin Ahlatcı , Bengü Akın

Öz

Bu çalışmada, takviye edilmemiş ZK60 alaşımı ve %0.2 ila %0.5 arasında değişen oranlarda alüminyum nitrür (AlN) nano partikülleri dahil edilmiş %15 silisyum karbür (SiC) parçacıklarıyla takviye edilmiş ZK60 matris kompozitinin mikro yapısı, mekanik özellikleri ve aşınma davranışı üzerindeki etkisi incelenmiştir. SiC ve AlN, ana alaşım olarak birincil toz magnezyum ile öngörülen miktarlarda mekanik olarak karıştırıldı, 500 MPa basınç altında ardından kompaktlar üretildi ve sinterlendi. Bundan sonra, yarı katı erime sıcaklığındaki mekanik bir karıştırıcı, sıkıştırılmış ve sinterlenmiş takviye malzemelerini ZK60 metal matrisine karıştırdı. Eriyikler 30 dakika homojenleştirildi ve kompozit numuneler yapmak için metal kalıplara döküldü. 410 °C'de 24 saatlik homojenizasyondan sonra, kompozit numuneler 320 °C'de 16: 1 oranında 0,3 mm/sn'de ekstrüde edildi. %15 SiC ile takviye edilen ZK60 matrisi, ilave AlN içeriğinin artmasıyla tane boyutunda bir azalma gösterdi. Döküm ZK60 alaşımının tane boyutu, %15 SiC ve %0.5 AlN eklenmesiyle %26 oranında azalırken, ekstrüzyon işleminden sonra aynı kompozitin tane boyutu %28 oranında azaldı. ZK60 matrisine döküm yoluyla %15 SiC ve %0.5 AlN eklenmesiyle sertlikte %37 oranında bir iyileşme sağlandı. Ekstrüde edilmiş ZK60 alaşımıyla karşılaştırıldığında, ekstrüde edilmiş ZK60 + %15SiC + %0.5 nano AlN kompoziti sertlikte ve basınç dayanımında %21 oranında iyileşme gösterdi. Ekstrüde edilmiş ZK60+15%SiC+%0.5 nano AlN kompozitinin aşınma hızı, ekstrüde edilmiş ve takviye içermeyen ZK60 alaşımınınkinden %37 daha düşüktür. Nano AlN ilaveli kompozitlerde mekanik özelliklerin ve aşınma direncinin artması, tane boyutunun iyileştirilmesine ve nanopartiküller tarafından dislokasyon hareketinin engellenmesine atfedilmektedir.

Anahtar Kelimeler

ZK60/AIN/SiC , mikro yapı , mekanik özellikler , aşınma

Microstructure characterization and wear properties of the new ZK60 SiC/AlN reinforced composites

Öz

This study examined the impact of incorporating aluminum nitride (AlN) nanoparticles, ranging from 0.2% to 0.5%, on the microstructure, mechanical characteristics, and wear behavior of and ZK60 matrix composite reinforced with 15% silicon carbide (SiC) particles and unreinforced ZK60 alloy. SiC and AlN were mechanically mixed in prescribed amounts with primary powder magnesium as the main alloy, then compacts were produced and sintered under 500 MPa pressure. After that, a mechanical mixer at semisolid melting temperature mixed the compacted and sintered reinforcement materials into the ZK60 metal matrix. The melts were homogenized for 30 min and poured into metal molds to make composite samples. After 24 h of homogenization at 410 °C, the composite samples were extruded at 0.3 mm/s at 320 °C with a ratio of 16: 1. The ZK60 matrix reinforced with 15% SiC exhibited a reduction in grain size with an increase in the additional AlN content. The grain size of the cast ZK60 alloy decreased by 26% with the incorporation of 15% SiC and 0.5% AlN, while that of the grain size after the extrusion process was reduced by 28%. The addition of 15% SiC and 0.5% AlN to the ZK60 matrix by casting resulted in a 37% improvement in hardness. In comparison to the extruded ZK60 alloy, the extruded ZK60+15%SiC+0.5% nano AlN composite exhibited enhancements in hardness and compressive strength by 21%. The wear rate of the extruded ZK60+15%SiC+%0.5 nano AlN composite is 37% inferior than that of the extruded and unreinforced ZK60 alloy. The enhancement of mechanical characteristics and wear resistance in composites with nano AlN additions is ascribed to the refinement of grain size and the obstruction of dislocation movement by nanoparticles.

Anahtar Kelimeler

ZK60/AIN/SiC , microstructure , mechanical properties , wear.

Kaynakça

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