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Transparent Compounds That Freeze Like Metals by K.A. Jackson; J.D. Hunt is a Engineering article available to read on EtoBox.

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MS temperatures favor twinned martensites (for review see Ref. 4). This is in agreement with resuIts on both f.c.c. (Cu for example(5)) and b.c.c. (iron for example@)) metals where plastic deformation takes place by twinning at low temperatures, suggesting that at these temperatures the critical resolved shear stress for twinning is lower than that for slip. On this basis low i?f, temperatures would be expected to favor transfornlation twinning in martensites. Thus all alloying elements which lower M, temperatures should favor twinning. important in determining twinning in steels which undergo the martensitic transformation. Also, there may be no direct ~o~el&tion between stacking fault energy of austenite and twinning in martensite. hTo observations of faulted martensites have been reported for steels, but in Cu-AI alloys of low stacking fault energy, the lattice invariant shear in martensite occurs by faulting.( 13) These considerations strongly suggest that the Xs temperature determines the occurrence of transfori mation twinning in martensitic structures, rather than the stacking fault energy of austenites.

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Author

K.A. Jackson; J.D. Hunt

Publisher

Elsevier Science; Elsevier ; University of Toronto Press; Elsevier BV (ISSN 0001-6160)

Published

1965

Language

EN

Field

Engineering (Physical Sciences)