IMG 1503123456

i

jMARD SYSTEMS,

g¥nehal yield

(TENSILE 5TPCSS

CLEAVAGŁ 71 or B.I F.3

Ol SOFT SYSTEM,

V TWINNING \

•^STRESS

"iFleawge^T

"nUCLEATION ’ IWOPAGATION GONTROL tOONTROLl

nfr

CLEAVAGE I

CONTRO ULED BY PRE-EX1STING CRACKS

GRAINS JCRACK PROPAGATIOnI

/    GRA IN    I

• yBOUNDARIES) O * |eq 2)

ductile

fracture

\^XnV\

ICREEP FRACTURhj J

V. ^    ^ IOT

b O

u

yj

DUCTILITY

»/. GRAINS CONTAINING MICROCRACKS

0-6

CREEP

STRAlN-fWTE

IO

107

o-a

IO

sec

\

N.\

Fig. 2. The defioition of ihe three ęleayagę. or brittle intergranular fracture (B.I-P.) ficlds. A toiallj brittle faflure front a pre-exisiing Baw. weJI below generał yield, is called cleayagc I or B.LF.ł. An almost (oially brittle failiiTe Erom a crack nucłeated by slip or twinning. bcłow generał yield. js called deavage 2 or BJ.Fj. A deayąge or brittle bo u nd ary faiłure aftcr generał yield. and witb m ca so rabie raia-to-faDure. is called c!eavagc 3 or B.I.F J.