Cryo treating blocks?

i'm nuts enough to type it all out, if i'd copied it, the spelling and grammar would be so much better, and way fewer words would have been used. year 10/11 school materials science...
chrystaline solids, dislocations in chrystaline structure why alloying works in respect to changeing properties, work hardening etc etc hopefully enough to give the gist...mind its 25 years since i had to stand on ceremony and get the eager minds to engage in something more than personal stereos, gangsta rap, extra long home rolled smokes, and who they were going thump next.

I'm a bit rusty

Dave