Question

4. Precipitation hardening (6 marks) a) Draw the successive positions of a dislocation as it bypasses non-deformable precipitates (hard particles) that obstruct its motion and explain the most influential factors. [2] b) If precipitates become deformable, explain the major differences compared to non- deformable precipitates. [4]

Answer 1

hard precipitat Particly Disl ocalon Intluencing factors precipitala Altrachue torce Exuited by dislocaltons the +the hard particly on and Non-Defomabl preciptaty h Pifterences betocen n the small par tice regîme ond dilmable larger particle egmu the patcly demable for detomablu partuu particki the intinsic propuhu o th pastick and atoy singth variu beformable pr.ctpitaty a diskocations cit thrduqh thom.. but in are coherent the are incoherat and as thu dislocations bypas ihem On ,when the dtlocations pau thrdugh the wealcly asth partcde si3e* deámable part du thu alloy shength stongly FoT when the diclocatione non bypow the partcy particlk propeieu but 's indapendent the 4upendant partcla On s and disprsian skength defsmebte pashi clu petomabk partdl -Non partick size Scanned.with CamScanner Srength