Which of the following will not strengthen a metal? Multiple answers: Multiple answers are accepted for this question Select one or more answers and submit. For keyboard navigation... SHOW MORE a Heat to 75% of melting temperature. b Add alloying elements Slow cool the material from 50% of melting temperature What is the effect of growing the grains in a polycrystalline metal? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a Makes metal harder b makes metal softer Doesn't do anything Which strengthening mechanism affects toughness the least? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a Alloying b Work hardening Grain refinement Which approaches to strengthening involve adding atoms or small clusters of atoms to strengthen a metal? 0 Multiple answers: Multiple answers are accepted for this question Select one or more answers and submit. For keyboard navigation... SHOW MORE V a Work hardening b Dispersion strengthening Precipitation hardening d Grain refinement What is the definition of percent cold work? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a (Final area)/(initial area) b (Change in area)/(initial area) (change in area)/(initial area) x 100 d (final length)/(initial length) x 100