Evaluation of TiAl۳ Intermetallic Formation Mechanism and Revolution of Annealing Texture in Al/Ti Powder/Al Laminate Composite Fabricated by Cold Roll Bonding and Post-Annealing Treatment

Publish Year: 1401
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:

JR_IJMF-9-2_003

تاریخ نمایه سازی: 10 اردیبهشت 1401

Abstract:

In this paper, bulk sheets of multilayer Al-Ti composites were fabricated by cold roll bonding (CRB) at ۵۰% thickness reduction and annealing in different conditions. The effects of annealing temperature and time on the bonding features of Ti-Al have been evaluated. The microstructural changes were studied by scanning electron microscopy (SEM) and focus ion beam microscope (FIB). A field emission electron microscopy (FEG-SEM) equipped with an electron backscatter diffraction (EBSD) tool was utilized to evaluate microstructural and textural changes. This study revealed that CRB composites of Ti-Al can produce the TiAl۳ in relatively short times at annealing temperatures under the Al melting point. The results showed that just the TiAl۳ intermetallic layer formed in the Ti/Al interface by ۲ h annealing at ۵۹۰°C. TiAl۳ formation mechanism can be stated as following stages, Al phase elimination, Kirkendall voids formation, Ti and TiAl۳ phase's volume increasing, micro-crack creation, and finally, easier formation of TiAl۳. Mechanical evaluation of Al/TiAl۳/Al layered composite showed that low ductility is related to growth and joining of Kirkendall voids around Al/TiAl۳ interface that formed after a ۲ h annealing at ۵۹۰°C. Microstructural characterization by EBSD revealed annealing at this condition led to the creation of Al matrix with large grains (about ۶۰ μm) and polycrystalline TiAl۳ intermetallic containing small grains (average ۵ μm). One of the main outputs from texture analysis is the recrystallization texture components changing after the formation of the TiAl۳ intermetallic compound. The presence of large Ti aluminide particles resulted into the creation of a new strong P recrystallization texture component besides R۵ and Q.

Authors

Z. Yazdani

Department of Materials Engineering, Isfahan University of Technology, ۸۴۱۵۶-۸۳۱۱۱, Isfahan, Iran

M.R. Toroghinejad

Department of Materials Engineering, Isfahan University of Technology, ۸۴۱۵۶-۸۳۱۱۱, Isfahan, Iran

H. Edris

Department of Materials Engineering, Isfahan University of Technology, ۸۴۱۵۶-۸۳۱۱۱, Isfahan, Iran

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