The fracture of a brittle material displays: Transgranular surface; Intergranula

Question

The fracture of a brittle material displays: Transgranular surface; Intergranular surface Rough surface; Smooth surface. Solid solution strengthening of an alloy arises from the: Ease of dislocation motion upon application of a shear stress; Difficulty of dislocation motion upon applied shear stress; Difficulty of diffusion; Existence of smaller cracks. The critical resolved shear stress is defined as: The resolved stress on the slip plane in the perpendicular direction of the slip; The resolved stress on the slip plane in a test sample in the direction of the slip; The yield strength of the material; Ultimate tensile strength of the material. Which statement is correct? Ultimate tensile strength of a material is usually higher than yield strength Yield strength of a metal is higher than fracture strength; Tensile strength of a metals is higher than compressive strength; If the material is more brittle, then its toughness is also, usually, higher, Eutectic transformation produces: Spherical second phase structures; Lamellar microstructures; 3D architectures; Smaller grains.

Explanation / Answer

(f) (i) transgranular surfaces

(g) (ii) Difficulty of dislocation motion upon application of shear stress

(h) (ii) The resolved stress on the slip plane in the direction of slip

(i) (i) Tensile strength of a material is usually higher than its yield strength

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