Shock deformation of k-state in Ni-Cr alloys

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Abstract
The change of electrical resistivity was used to study the ordering kinetics and the anomalous resistivity behaviour in Ni-22 wt. % Cr and Ni-30 wt. % Cr (Ni-22 Cr and Ni-30 Cr) before and after shock deformation. Ordering was found to occur in two stages: the attainment of an equilibrium domain size, and the increase of long-range order (LRO) within the domains. Specimens of Ni-22 Cr and Ni-30 Cr in the ordered and disorderd states were subjected to explosive shock loading at shock pressures between 90 and 300 kbars. In the pressure range of 200 to 300 kbars, the resistivity of the ordered alloys decreased sharply. The resistivity of the shock-deformed initially quenched alloys decreased continuously between 90 and 300 kbars. The decrease in resistivity with shock deformation for the quenched alloys was related to the destruction of short-range order (SRO).