Microstructure, crystal structure and mechanical properties of the new ternary intermetallic alloy phase Zr₂TiAl

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• 作者：D. Sornadurai^a ; ^{sorna@igcar.gov.in} ; V.S. Sastry^a ; V. Thomas Paul^b ; Roberta Flemming^c ; Feby Jose^d ; R. Ramaseshan^d ; S. Dash^d
• 关键词：A. Ternary alloy systems ; B. Phase identification ; C. Melting ; D. Grain-boundary character distribution ; F. Diffraction (X-ray)
• 刊名：Intermetallics
• 出版年：2012
• 期刊代码：36_09669795
• 类别：ms
• 出版时间：May, 2012
• 卷：24
• 期：Complete
• 页码：89-94
• 文件大小：2012 K

摘要

Zr₃Al is an intermetallic compound with a cubic structure whereas the isoelectronic compound Ti₃Al is hexagonal. Crystallographic, microstructural and mechanical study of an alloy containing all the three elements is use in advancing our knowledge of the phase behavior across this pseudobinary alloy. A nominal composition of the Zr₂TiAl alloy was prepared by arc melting and subsequently vacuum annealed at 1050聽掳C for 30 days and 1000聽掳C for 20 days. Scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDAX) showed the presence of three phases in the material. Among the three phases, the major phase was the stoichiometric Zr₂TiAl alloy. From the SEM micrograph, it was seen that the major phase grains varied in size from 10聽渭m to 50聽渭m. Of the two minor phases present in the specimen, one is rich in Ti and the other in Al. In order to identify the peaks due to individual phases, micro-beam XRD was carried out, enabling the identification of all the three unambiguously.聽The stoichiometric alloy (Zr₂TiAl) has L2₁ structure (space group Fm3m), the Ti-rich phase has DO₁₉ structure (space group P6₃/mmc) and the Al-rich phase has A_a structure (space group I4/mmm) Further, mechanical characterization of this alloy was carried out using nano-indentation and the typical hardness was found to be 8.5聽GPa on the grain and 7.4聽GPa at the grain boundary.