Related Questions

The grain boundary is made of a regular array of edge dislocation at define spacing. In the case of low angle grain boundary, the distance between dislocation array will be small, and for high angle grain boundaries, it will be large.
Grain boundaries are highly prone to corrosion than the grain faces.
Corrosion of less corrosion-resistant metal is usually increased and the attack of the more corrosion-resistant is decreased in galvanic corrosion.
The presence of nickel at grain boundaries greatly increases the grain boundary lattice-diffusion of tungsten.
Corrosion along the grain boundaries is called as __________
At _________________ the grain boundaries of polycrystalline metals act as ________ for cracks.
Grain boundary diffusion makes a significant contribution to the total flux when___(Db and D1 are the diffusivities through the grain boundary and defect free lattice and ȣ, d are the effective thickneβ and grain size).
Calculate the mean diameter of the grain at t=5sec, Assume the grain boundary energy and mobility are given as 5 Nmm-1 and 10mm3J-1s-1 respectively? (Assume the mean size of the grain at t=0 as 3mm)
The largest size of immobilised segment of dislocation in a Frank Read (FR) source contained in a polycrystalline material is of the order of grain size. In a metal of 10 μm grain size, the shear stress required to operate such a FR source is 100 MPa. If the grain size in the same metal is reduced to 10 μm, the shear stress required to operate such FR source would be . . . . . . . . MPa.
In order to double its yield strength, the grain size of a steel of ASTM grain size number 2 should be changed to ASTM grain size number (neglect friction stress)