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- W1969451161 abstract "Abstract Deformation twinning has been documented by means of transmission electron microscopy (TEM) in the γ′-phase in two nickel aluminide alloys, single-phase Ni3Al + B and two-phase Ni-20at.%Al-30at.%Fe. The first intermetallic was shock loaded to a stress of 14 GPa, and the second was dynamically deformed at a strain rate of 3000s−1 to a total accumulated strain of 16%. In both materials, twins were found to form solely in grains with the L12 superlattice structure and were observed to extend completely across the grains. In the two-phase alloy, no twins were found to occur in grains with the B2 superlattice structure. Analysis of the twins show that the twinning plane K1 is {111} with a twinning direction η1 of 〈112〉, such as is commonly found in disordered f.c.c. metals. It is proposed that the η2 direction in the second undistorted plane K2 is 〈110〉, which negates the need for atomic shuffling. The twinning mechanism necessary for this twin plane and the alternate η2 direction of 〈112〉 requiring shuffles is discussed. Extensive planar slip on {111}-type planes was also seen in both materials, and in both the B2 and the L12 grains in the two-phase alloy. A high density of stacking faults was observed in the shock-loaded single-phase alloy." @default.
- W1969451161 created "2016-06-24" @default.
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- W1969451161 date "1994-07-01" @default.
- W1969451161 modified "2023-09-24" @default.
- W1969451161 title "A description of deformation twinning in dynamically deformed and shock-loaded polycrystalline Ni<sub>3</sub>Al" @default.
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- W1969451161 doi "https://doi.org/10.1080/01418619408242542" @default.
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