Abstract
Samples of molybdenum TZM alloy in sheet form have been investigated in the warm-worked condition and after recrystallisation heat treatments to produce a range of different grain sizes. Orientation distributions were calculated from measured pole figure data and specimens were cut at various angles around the sheet to determine the planar variations in Young's modulus and microyield stress. Elastic moduli have been calculated for the materials on the basis of several different models using the preferred orientation data. Excellent agreement is found between the measured moduli and those calculated according to the Eshelby-Kröner-Kneer model. Variations in stress level from grain to grain were also calculated according to this model and used to predict the initiation of plastic flow, i.e. the microyield point. These predictions also agree closely with measured values. Variation of grain size did not have a major influence on elasticity or microyielding.