Multiple Mechanisms Improving The Mechanical Properties Of Surface Metal Matrix Composites Obtained By Friction Stir Processing

Yıl 2021, Cilt: 62 Sayı: 705, 681 - 701, 08.12.2021

Gökçe Mehmet Gençer

https://doi.org/10.46399/muhendismakina.930170

Öz

Friction stir processing (FSP), a technique based on the principles of friction stir welding (FSW), is a solid-state method that was developed to enhance the properties of metallic materials. The possibility of the addition of hard second phase particles to matrix structure by distributing, subsequently caused that this method has also been used commonly in surface metal matrix composite (SMMC) manufacturing. By means of the advantages of being a simple, environmentally friendly, and cost-effective solid-state method, FSP has come into prominence more than various liquid and gas-phase methods that are used to manufacture SMMCs. In the FSP method, multiple mechanisms take part together in enhancing the microstructure and mechanical properties of the material during processing. These strengthening mechanisms in matrix structure obtained by hybridizing the specific properties gained to processed material by the FSP method and the enhanced properties by distributing the hard second phase particles in the matrix material. In this study, the effects of hard second phase particles, dynamic recrystallization (DRX), Zener pinning, and Orowan mechanism in the enhancement of mechanical properties of the SMMCs manufactured by FSP were investigated.

Anahtar Kelimeler

Friction stir processing, Dynamic recrystallization, Zener pinning, Orowan mechanism

Sürtünme Karıştırma Prosesi ile Elde Edilen Yüzey Metal Matrisli Kompozitlerin Mekanik Özelliklerini Geliştiren Çoklu Mekanizmalar

Öz

Sürtünme karıştırma prosesi (SKP), sürtünme karıştırma kaynağı (SKK) yöntemi esaslı olup, metalik malzemelerin özelliklerini iyileştirmek için geliştirilmiş bir katı hal yöntemidir. Yöntem ile sert ikincil faz partiküllerin matris yapısına dağıtılarak eklenebilme (yerleştirilebilme) imkanı, yöntemin sonradan yüzey metal matrisli kompozit (YMMK) üretiminde de yaygın şekilde kullanılmasını sağlamıştır. Basit, çevreci ve düşük maliyetli bir katı hal yöntemi olması, yüzey kompoziti üretiminde kullanılan birçok sıvı ve gaz hal yöntemlerine göre daha ön plana çıkmasını sağlamıştır. Sürünme karıştırma prosesiyle yüzey metal matrisli kompozit elde ederken malzemenin mikroyapısının ve mekanik özelliklerinin geliştirilmesinde birçok farklı mekanizma birlikte rol oynamaktadır. Matris yapısında elde edilen bu mukavemet arttırıcı mekanizmalar, yöntemin işlem gören malzemeye kazandırdığı kendine has özellikler ile kullanılan sert ikincil faz partiküllerin matris yapısına dağılmasıyla gelişen özelliklerin melezlenmesi ile sağlanmaktadır. Çalışmada SKP ile elde edilen YMMK’lerin mekanik özelliklerindeki gelişmede sert ikincil faz partiküllerin, dinamik rekristalizasyonun, Zener sabitlemenin (iğneleme) ve Orowan mekanizmasının etkileri incelenmiştir.

Anahtar Kelimeler

Sürtünme karıştırma prosesi, Dinamik rekristalizasyon, Zener sabitleme, Orowan Mekanizması

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