Effects of B4C Addition on the Laser Beam Welding Characteristics of Al/SiC MMCs Produced By P/M

Fusion weldability characteristics of metal matrix composites (MMC) produced by powder metallurgy (P/M) are usually insufficient due to unwanted micro-structural changes that occur during welding. This study aims to investigate the effects of B4C addition as reinforcement on the weld quality of Al/SiC MMCs. After the production of Al/SiC MMCs by P/M with or without the addition of B4C, laser beam welding (LBW) characteristics of the materials were investigated by focusing on the integrity of the welds. Optical microscopy (OM), scanning electron microscopy (SEM), and energy dispersive X-ray analysis (EDX) were utilized for the characterization of the welds. Results show that Al/SiC MMCs produced by P/M can not be easily welded by LBW, but weldability characteristics of the material can be improved by the addition of B4C.

T/M ile Üretilen AI/SiC MMK’lerde B4C Katkýsýnýn Laser Iþýn Kaynaðý Karakteristiklerine Etkileri

Toz Metalurjisi (T/M) ile üretilen metal matrisli kompozitlerin (MMK) ergitme kaynak kabiliyetleri genellikle yetersizdir.Bunun sebebi kaynak iþlemi sýrasýnda oluþan istenmeyen mikro-yapýsal deðiþimlerdir. Bu çalýþma, Al/SiC MMK’lerde takviye elemaný olarak B4C ilavesinin kaynak kalitesine etkilerini incelemeyi amaçlamaktadýr. Al/SiC MMK’lerin, B4C takviyesi yaparak ve yapmadan imal edilmesinden sonra, malzemelerin lazer ýþýn kaynaðý karakteristikleri, kaynak bölgesinin bütünlüðü açýsýndan incelenmiþtir. Kaynaklarýn karakterizasyonu için; optik mikroskobisi (OM), taramalý elektron mikroskobisi (SEM) ve enerji-dispersif X-ýþýný analizleri (EDX) kullanýlmýþtýr. Sonuçta, T/M ile üretilen Al/SiC MMK’lerin lazer ýþýn kaynaðý ile kolayca kaynatýlamadýðý, B4C ilavesi ile malzemenin kaynak kabiliyetinin arttýðý görülmüþtür.