map for tungsten is sthown below with contour lines representing 1. Deformation-

Question

map for tungsten is sthown below with contour lines representing 1. Deformation-mechanism different strain rates with the unit of s (a) Caleulate what the strain ratei (red contour) and strain rate2 (blue contour) are. (b) Determine the constant r in the dislocation creep field that follows the expression of KT G TEMPERATURE C 1000 1500 20250300 500 TUNGSTEN 4-10? . ?THEORETICAL STRENGTH DISLOCATION GLIDE DIS OCATION rate 10 s t COELE CREEP 110 -8 NABARRO-1 ? it CREEP stra nra 10 HovOLOGOUS TEMPERATURE T

Explanation / Answer

a) strain rate 1( red colour 10-9 )
---- strain rate 2 (blue colour 10-2 )
-Nabarro-Herring Creep (diffusion through the lattice) : ? = AD(? /d2)
-Coble Creep (diffusion through grain-boundaries)
: ? = A D( ? /d3 )
b) In the dislocation creep field the value of constant n = 5

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