Al-Mg合金単結晶の高温変形

概要

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High temperature deformation mechanisms of solid solution alloys is usually classified into 2 groups. One is the recovery rate control mechanism, such as the dislocation climb for example (class II), and the other is the dislocation glide mechanism (class I). This classification corresponds well with the difference in stress exponent between 5 and 3. Al-Mg alloy is well known as a typical alloy of class I and many investigations have been done on this alloy system. In the present study, single crystals of Al-Mg alloy were used in order to exclude the grain boundary effect. The results obtained are summarized as follows : (1) The stress exponent was about 3 independent of the initial orientation of tensile axis. (2) From the initial stage, the deformation proceeded by multiple glides. (3) The steady state stress level was determined by the number of the glide systems and the magnitude of the Schmid factors. (4) The apparent activation energy for the steady state deformation was about 105kJ/mol. This agrees well with the activation energy for the self-diffusion of Mg in Al. (5) The direct observation of deformed samples showed a very homogeneous distribution of dislocations.
社団法人日本材料学会の論文
1980-12-15