Abstract
A study was initiated in 1987 to examine structure and properties of grain boundaries in the B2 ordered alloys FeAl and NiAl. This project continued from 1990, with initial emphasis on CoAl, FeCo, and CuZn, but with continued work on FeAl and NiAl. Effect of alloy composition on structure/chemistry and properties of grain boundaries were examined by measuring yield strength vs grain size, measuring grain boundary composition using a scanning Auger electron microprobe, examining dislocation/grain boundary interactions during in-situ straining in TEM, and determining fracture modes and assessing strain extent at fracture surfaces using selected area channeling patterns. Progress during the last 3 years is reviewed.
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