Strengthening of an iron base, nickel bade, and cobalt base alloys is done by __________
(a) Precipitation hardening
(b) Grain boundary hardening
(c) Dispersion hardening
(d) Transformation hardening
The question was asked during an interview.
My doubt stems from Mechanisms of Creep & Creep Resistant Materials in chapter Plastic Deformation and Creep in Crystalline Materials, Elastic, Anelastic and Viscoelastic Behaviour of Engineering Material & Metallurgy