B4C Takviyeli Magnezyum (AZ91) Matrisli Kompozitlerin Mikroyapısal Karakterizasyonu

Year 2019, Volume: 11 Issue: 1, 18 - 24, 31.01.2019

İşıl Kerti

https://doi.org/10.29137/umagd.388600

Abstract

B₄C takviyeli Magnezyum matrisli
kompozit malzemelerden beklenen yüksek sertlik, aşınma direnci ve rijitlik
özelliklerinin elde edilebilmesi için B₄C ile sıvı magnezyum
arasındaki ıslatma sorununun giderilmesi çok önemlidir. Bu çalışmada, % 5 ve
%10 B₄C ile takviye edilmiş magnezyum matrisli (AZ91) kompozit
malzemeler 750⁰C'de karıştırma döküm yöntemi kullanılarak
üretilmiştir.  Üretilen kompozitlerin
mikroyapı ve matris/takviye arayüzleri Tarama Elektron Mikroskobu (SEM)
kullanılarak, matris/takviye arasındaki reaksiyon tabakası EDS analizi ve
X-ışını haritalaması ile karakterize edilmiştir. Yüksek çözünürlüğe sahip FEG-SEM
ile yapılan mikroyapısal inceleme sonucunda, arayüzeyde oluşan ince tabakanın
Mn-C ve Al-B bileşiklerinden oluştuğu 
belirlenmiştir.

Keywords

Kompozit, Magnazyum, Arayüzey, Bor karbür, Karıştırma döküm, AZ91

Microstructural Variations In Cast B4C-Reinforced Magnesium Matrix Composites

Abstract

It is very important to
overcome the wetting problem between B₄C and liquid magnesium so
that the high hardness, wear resistance and stiffness properties expected from
B₄C reinforced Mg matrix composite materials can be obtained. In the
present work, Magnesiıum matrix (AZ91) composites reinforced with 5 and
10%(wt.) B₄C_P were produced by using stir casting method
at 750⁰C. Microstructure and matrix/reinforcement interfaces of
produced composites were have been characterized using scanning electron
microscopy (SEM) studies. The reaction layer between matrix/reinforcement was
also characterized with EDS analysis and X-ray mapping. It was found from the
microstructural observations by high resolution field emission gun SEM
(FEG-SEM) that the wetting improved by the formation of very thin Mn-C and Al-B
reaction layers.

Keywords

AZ91, Composite, Magnesium, Interface, Boron Carbide, Stir Casting, AZ91

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