H. Sato et al., EFFECTS OF THE 3RD ELEMENT ON CREEP-BEHAVIOR OF AL-MG AND ALPHA-FE-BESOLID-SOLUTION ALLOYS, Materials science & engineering. A, Structural materials: properties, microstructure and processing, 234, 1997, pp. 1067-1070
In creep of alpha-iron, IS effects (interstitial-substitutional intera
ction) were reported. Similar effects are expected in ternary substitu
tional solid solutions. In the present report, effects of the second s
ubstitute (the third element), whose size misfit is small, on creep be
havior and the transition stress from Alloy-type to Metal-type have be
en investigated experimentally. Three alloy systems are employed, i.e.
aluminum-magnesium-zinc, aluminum-magnesium-lithium and alpha iron-be
ryllium-manganese solid solutions. Although no change in equivalent ma
gnesium concentration by the addition of zinc nor lithium is expected,
creep rates and the transition stress in Al-Mg alloys are affected by
these third elements. Similar changes are observed in alpha iron-bery
llium-manganese system. Substitutional elements are not always indepen
dent with each other, so that the apparent interaction between the fir
st substitute, i.e. magnesium or beryllium, and a dislocation can be a
ffected by the third elements. (C) 1997 Elsevier Science S.A.