An unidentified material has a yield strength of 75 MPa with…

An unidentified material has a yield strength of 75 MPa with an average grain diameter of 6.25×10-2 mm. At a yield strength of 175 MPa, the same material has an average grain diameter of 6.94×10-3mm. Calculate the yield strength when the average grain diameter is 1.0×10-3 mm.

Assume solidification of Nickel occurs by homogeneous nuclea…

Assume solidification of Nickel occurs by homogeneous nucleation. What is the critical radius that exist at the degree of supercooling = 200°C? The latent heat of fusion and surface free energy are -2.53 x 109 J/m3 and 0.255 J/m2, respectively. (Tm = 1455 °C)