Carbide and hydride formation during mechanical alloying of titanium and aluminium with hexane

Jari Keskinen, Andrew Pogany, James Rubin, Pekka Ruuskanen

Research output: Contribution to journalArticleScientificpeer-review

37 Citations (Scopus)

Abstract

Mixtures of elemental titanium and aluminium powders of overall composition TixAl1+x (x = 0.02, 0.3, 0.4, 0.5, 0.6, 0.7, 0.75, 0.8) were mechanically alloyed in a planetary-type ball mill.
Hexane was added as a process control agent to reduce powder agglomeration during milling. The as-milled powders were characterized using X-ray diffraction, differential scanning calorimetry, scanning electron microscopy and transmission electron microscopy. During milling, the hexane is partially dissociated, with the free carbon and hydrogen incorporated within the TixAl1 − x alloy powders in increasing amounts with increasing milling time.
The amount of incorporated carbon increases with the initial Ti content of the powder mixture, reaching a maximum of 12 wt.% incorporated into an initial Ti0.8Al0.2 powder mixture after 100 h of milling. The hydrogen is found to combine with elemental Ti to form TiH2−x, with an initial Ti0.5Al0.5 powder mixture milled for 40 h incorporating 0.95 wt.% H. The milled (TixAl1 − x + C) powder mixtures form a large fraction of amorphous phase near x = 0.5.
Annealing of the as-milled powders incorporating dissolved carbon and hydrogen produced a mixture of Al2Ti4C2, TiC and TiAl.
Original languageEnglish
Pages (from-to)205-211
JournalMaterials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume196
Issue number1-2
DOIs
Publication statusPublished - 1995
MoE publication typeA1 Journal article-refereed

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