The yield stress of single crystals of α-phase Cu-Ni-Pd and Cu-Pd alloys

Abstract
Single crystals of Cu- x at. % Ni- x at. % Pd [ x ═ 1 to 6] and Cu- x at. % Pd alloys [ x ═ 1, 2, 4 and 6] were deformed in tension at 293 K and 4.2 K. The crystals had the [331] {͞110} {͞1͞16} orientation which has two equivalent {͞1͞11} and {͞1͞11} primary glide systems. The concentration dependence of the critical resolved shear stress σ at the yield point for both alloy series was given by σ T ═ σ 0 ( T )+ A ( T ) c α , where σ 0 ( T ) and A ( T ) are constants for one alloy series at T K and c is the atomic concentration of the solute. The exponent α is 0.72 or 0.73 for the Cu-Ni-Pd and 0.61 or 0.62 for the Cu-Pd alloy series at 293 or 4.2 K. The data for both alloy series could be fitted to the relation σ 4.2K -σ 293K ═ 1.046+0.526σ 4.2K [MPa]. This establishes the stress equivalence behaviour of single crystals of these alloys.

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