The Deformation of Copper and Iron Crystals by Unidirectional Abrasion

D. M. Evans, D. N. Layton, H. Wilman
1951 Proceedings of the Royal Society A  
P la te s 1 to 6] W ith th e aim o f te stin g fu rth e r th e conclusion (W ilm an 1950 a) th a t a new d efo rm atio n process, ro ta tio n a l slip, occurs p ro m in e n tly w hen c ry sta l surfaces are a b ra d e d u n id irectio n ally , a n a p p ro x im ately {110} face o f a copper c ry sta l w as sm o o th ed b y electro-polishing, a b ra d e d along <1T0> a n d exam ined b y electro n diffractio n a fte r v ario u s stages o f etching. T h e im m ed iate surface regions w ere h eav
more » ... gions w ere h eav ily d iso rie n ta te d , b u t th o se slig h tly below th e surface h a d m o stly becom e ro ta te d b y a b o u t 35°, th o u g h a decreasing p ro p o rtio n w as ro ta te d by larg er angles u p to a b o u t 90°, a b o u t th e cube edge lying in th e surface a n d n o rm al to th e a b rasio n directio n . W hen abrasion w as along <0Q1> or , ro ta tio n occurred a b o u t <1T0> a n d <111> respectively. I n iron, also, large ro ta tio n o f p a rts o f th e c ry sta l surface occurred w h en c ry sta ls w ere a b ra d e d parallel to e ith e r {100}, {110} or {111} plan es w hich were n o rm al o r steep ly inclined to th e surface. T he in te rp re ta tio n in te rm s o f ro ta tio n a l slip on {001}, {110} or {111} p lan es is fully su p p o rted b y previous m etallo g rap h ic o b serv atio n s o f such ro ta te d lam ellae form ed p a rallel to these planes in copper (and alum inium ) a n d iron, an d b y elec tron-diffraction evidence o f th e stru c tu re of b e a te n m e ta l foils. I t is p o in te d o u t th a t th e d efo rm atio n caused b y th e ab rasio n is analogous to th e dev elo p m en t o f 'd efo rm atio n b a n d s '. whereas they were incompatible with any of the previously known processes of deformation. These results are described in part I, and further results (obtained by D. N. Layton and H. Wilman) on iron are described in part II.
doi:10.1098/rspa.1951.0014 fatcat:4jbonukbszf3pjoeq3uchwy7be