Alüminyum Alaşımlı Metal Matris Kompozitlerde Korozyon Yorulma Çatlak Büyümesinin İncelenmesi: Karşılaştırmalı Bir Çalışma

Abstract

Tuzlu ortamların zorlu koşullarına dayanabilecek yüksek mukavemetli alaşımlara duyulan ihtiyaç, mühendislik uygulamalarında yaygın bir zorluktur. Bu malzemeler korozif koşullar altında yapısal bütünlüklerini korumalıdır. Alüminyum bazlı kompozitlerin korozyon yorgunluğu, kompozitin mukavemetini ve hizmet ömrünü önemli ölçüde azaltabileceğinden, bu malzemelerin tasarımında ve kullanımında önemli bir husustur. Korozyon yorgunluğu, bir malzeme tekrar tekrar korozif bir ortama ve döngüsel yüklemeye maruz kaldığında ortaya çıkar ve çatlak oluşumuna ve nihayetinde malzemenin hasar görmesine yol açar. Alüminyum bazlı kompozitlerin korozyon yorgunluğuna karşı duyarlılığı, kullanılan takviye tipi ve miktarı, matrisin bileşimi ve spesifik aşındırıcı ortam gibi çeşitli faktörlere bağlıdır. Bu nedenle, kompozitin amaçlanan uygulamada uzun ömürlü ve güvenilir olmasını sağlamak için bu faktörlerin dikkatlice değerlendirilmesi ve uygun testlerin yapılması önemlidir. Bu çalışmada, 2124-T4 +%25 SiCp/Al kompozitler üzerinde oda sıcaklığında ve %3.5 tuz çözeltisi ortamında dört farklı gerilme oranında yorulma çatlağı büyüme testleri gerçekleştirilmiştir. Düşük gerilme oranlarında tuz çözeltisinin etkisinin yorulma çatlak büyüme oranları üzerinde önemli olduğu bulunmuştur. Bununla birlikte, tuzlu ortamın yorulma tepkisi üzerindeki etkisi yüksek gerilme oranlarında azalmıştır.

Keywords

• Korozyon yorulması
• yorulma çatlak ilerlemesi
• Al-alaşım kompozitler
• tuz çözeltisi
• hidrojen gevrekleşmesi

Investigation of Corrosion Fatigue Crack Growth in Aluminium Alloy-Based Metal Matrix Composites: A Comparative Study

Abstract

The need for high-strength alloys that can withstand the harsh conditions of saline environments is a common challenge in engineering applications. These materials must maintain their structural integrity under corrosive conditions. Corrosion fatigue of aluminium-based composites is an important consideration in the design and use of these materials, as it can significantly reduce the strength and service life of the composite. Corrosion fatigue occurs when a material is repeatedly exposed to a corrosive environment and cyclic loading, leading to the formation of cracks and eventual failure. The susceptibility of aluminium-based composites to corrosion fatigue depends on several factors, including the type and amount of reinforcement used, the composition of the matrix and the specific corrosive environment. It is therefore important that these factors are carefully considered and appropriate testing carried out to ensure the longevity and reliability of the composite in its intended application. In this study, fatigue crack growth tests were carried out at four different stress ratios on 2124-T4 +25% SiCp/Al composites at room temperature and in a 3.5% salt solution environment. It was found that the influence of the salt solution at low stress ratios was significant on the fatigue crack growth rates. However, the effect of the saline environment on the fatigue response diminished at high stress ratios.

Keywords

• Corrosion fatigue
• fatigue crack propagation
• Al-alloy composites
• salt solution
• hydrogen embrittlement

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