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- W2289712812 abstract "The temperature dependence of the plastic yield stress of cleavage slabs of Norton Company magnesium oxide, containing approximately 0.2% impurity, has been investigated up to 1000 deg C for bending under three-point loading. Prior thermal history has been found to be an important variable. In particular, annealing followed by a rapid quench produces a marked softening, and at the same time causes a homogenization of the starting material. Such samples have displayed inflections in strength vs. temperature, corresponding to a minimum in the vicinity of 500 deg C followed by a maximum at around 700 deg C. At temperatures above those associated with the inflections, the samples show pronounced yield-point barriers, and subsequent deformation occurs by jerky flow. The various observations have been discussed in terms of the interactions of dislocations with impurities that may be in precipitate or solution form, depending on past history and conditions at the time of testing. In particular, interpretation is based on conventional precipitation hardening and solution softening mechanisms commonly known for metals, as well as in terms of the related concepts of the charges on ionic dislocations with surrounding charged ion vacancy clouds, as they are affected by solution impurities. (auth)" @default.
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- W2289712812 date "1960-04-20" @default.
- W2289712812 modified "2023-09-27" @default.
- W2289712812 title "TEMPERATURE DEPENDENCE OF PLASTIC YIELD STRESS IN MAGNESIUM OXIDE SINGLE CRYSTALS" @default.
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