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The relaxation behaviour of strenght and fracture toughness of amorphous metal‐metalloid alloys
Author(s) -
Wetzig K.,
Pompe W.,
Fiedler H.,
Aljochin V. P.
Publication year - 1983
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170180921
Subject(s) - materials science , annealing (glass) , fracture toughness , ultimate tensile strength , impurity , amorphous metal , composite material , amorphous solid , indentation hardness , toughness , deformation (meteorology) , metallurgy , microstructure , crystallography , chemistry , organic chemistry , alloy
The effect of an annealing treatment on crack and fracture kinetics and on mechanical properties of Fe 40 Ni 40 P 10 B 6 and Fe 5 Co 70 Si 15 B 10 amorphous ribbons — both pure and with defined impurities — was investigated by in‐situ tensile experiments in SEM. The effect of relaxation processes on tensile strength, microhardness and fracture toughness was analysed. A result of technological interest is the increase of fracture toughness after an annealing treatment in the temperature range T ann. = (0.55 … 0.6) · T cryst. . This effect will be enhanced by defined chemical impurities, and it can be well interpreted by a model of fracture toughness variation during a temper process. In this model the deformation behaviour cannot be described within the scope of a homogeneous solid, but it is determined by a relationship between closely localized deformation instabilities.