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Structure of mechanically alloyed Ti-Al-Nb powders

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Abstract

Ti-Al-Nb ternary powder mixtures containing 24Al-11Nb, 25Al-25Nb, 37.5Al-12.5Nb, and 28.5Al-23.9Nb (at. pct) were mechanically alloyed in a SPEX 8000 mixer mill using a ball-to-powder weight ratio of 10:1. The structural evolution in these alloys was investigated by X-ray diffraction and transmission electron microscopy techniques. A solid solution of Al and Nb in Ti was formed at an early stage of milling, followed by the B2/body-centered cubic (bec) and amorphous phases at longer milling times. The stability of these phases and their transformation to other phases have been investigated by heat treating these powders at different temperatures. The B2/bcc phase transformed into an orthorhombic (O-Ti2AlNb) or a mixture of the orthorhombic (O) and hexagonal close-packed (α2-Ti3Al) phases, the proportion of phases being dependent on the powder composition. Milling beyond the amorphous phase formation resulted in the formation of an fee phase in all the powders, which appears to be TiN, formed as a result of contamination of the powder.

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Author notes

  1. Guo-Hao Chen

    Present address: Branson Ultrasonics Corporation, 06810, Danbury, CT

Authors and Affiliations

  1. Department of Metallurgical and Mining Engineering, University of Idaho, ID 83844-3026, Moscow

    C. Suryanarayana (Professor, Associate Director) & F. H. Sam Froes (Professor, Director)

  2. Institute for Materials and Advanced Processes, University of Idaho, ID 83844-3026, Moscow

    C. Suryanarayana (Professor, Associate Director) & F. H. Sam Froes (Professor, Director)

Authors
  1. Guo-Hao Chen
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  2. C. Suryanarayana
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  3. F. H. Sam Froes
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Formerly Graduate Student, University of Idaho

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Chen, GH., Suryanarayana, C. & Froes, F.H.S. Structure of mechanically alloyed Ti-Al-Nb powders. Metall Mater Trans A 26, 1379–1387 (1995). https://doi.org/10.1007/BF02647588

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