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it has suggested that the sliding wear of metals commonly includes the following sequence of events: large plastic strains resulting from asperity contacts, generation of a heterogeneous substructure consistent with large strains, shear instability leading to transfer of material from one sliding component to the other, mechanical mixing which produces an ultra-fine grain size material on the surface, and removal of this mechanically mixed material as wear debris particles. The phenomena were successfully explained on an immobilized action by cross-slip and thermal activated process of superdislocations in L1 2 crystalline structures of the Ni3Al-type alloys. It has been suggested that the high hardening rate in the ordered crystals may be due to the generation of antiphase domain boundary(APB) tubes formed by cross-slip pinning. The APB and/or stacking fault energy of different lattice plans in ordered structures change with temperature. When the difference is lower following raised temperature, the cross-slipping of the screw dislocations occurs more easily and finally results in high strain hardenability. In fact, the selected NAC-alloy has constant yield strength of not less than 600 MPa up to 600 ◦C, and over 5% room temperature tensile elongation. The alloy has also a higher work-hardening [31], which means that a deformation induced hard layer at the worn surface can be formed quickly, and the hardness of the layer even further raised by an increased surface temperature from friction. |
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