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The deflection of cracks in grain interior was observed in a metastable β-phase Ti alloy (Ti-24Nb-4Zr-7.9Sn) with transmission electron microscopy during high cycle fatigue. This peculiar phenomenon is induced by the β → α″ martensitic transformation in front of crack tips in grain interior when cracks propagate along the {011}β slip planes with acute angles between α″ lamellae and cracks approximately...
In order to precise the role of the electric current involved in the spark plasma sintering (SPS) technique on the microscopic mechanisms occurring at the necks between TiAl powder particles during densification, transmission electron microscopy thin foils have been extracted at the necks on interrupted states, for the first time, by focused ion beam. Microscopic plasticity mechanisms and recovery-recrystallization...
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