PPT Slide
Figure 2-2. Effect of temperature on the yield strength of body-centered cubic
Ta, W, Mo, Fe, and face-centered cubic Ni
The temperature dependence of flow stress at constant strain and strain rate generally can be represented by
where Q= an activation energy for plastic flow, cal/g mole
R= universal gas constant, 1,987 cal/(deg)(mole)
If this expression is obeyed, a plot of ln versus will give a straight line with a slope of