50 pts List the mechanisms that are responsible for increasi

(50 pts) List the mechanisms that are responsible for increasing the yield strength of a pure metal or alloy (6 total).

a) Indicate which 2 can be used in strengthening pure metals

b) Indicate which 4 are only effective in alloys.

c) Of the 4 strengthening mechanisms that are only applicable to alloys: i) which strengthening mechanisms form under non-equilibrium conditions. ii) which strengthening mechanisms form under equilibrium conditions.

d) If you were selecting an alloy for elevated temperatures, which 2 methods of strengthening would you want to consider?

Solution

LIST OF MECHANISMS

1)STRENGTHENNG BY GRAIN SIZE REDUCTION

2)SOLID SOLUTION STRENGTHENING

3)STRAIN HARDENING

4)FIBER STRENGTHENNG

5)PRECIPITATION HARDENING

6)DISPERSION HARDENING

A)FOR PURE METAL STRAIN HARDENING AND STRENGTHENNG BY GRAIN SIZE REDUCTION

B)FOR ALLOYS DISPERSION HARDENING,PRECIPITATION HARDENING,FIBER STRENGTHENNG,SOLID SOLUTION STRENGTHENING

C) i)DISPERSION HARDENING,PRECIPITATION HARDENING,FIBER STRENGTHENNG

ii)SOLID SOLUTION STRENGTHENING

D)DISPERSION HARDENING,PRECIPITATION