多結晶体アルミニウムの再結晶過程に発達した下部組織について

概要

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The influence of the sub-structure developed during the recrystallization heat treatment on tensile properties was investigated on high-purity aluminum (99. 99%) having the sub-structure of various sizes. These sub-structures were introduced by adopting different annealing temperatures and times suitable to the given prestrain. The results obtained are summarized as follows ; (1) The flow stress σ_f is related to the sub-grain size t by the Petch's equation σ_f =(σ_0 +K_st^<-1/2> where the value frictional stress σ_0 becomes negative when the amount of re-strain is small, such as 0.2%. (2) The flow stress σ_f is related to the product of the square root of misorientation α and the inverse square root of sub-grain size t by a linear equation σ_f = σ_0 +K_Mα^<1/2>t^<-1/2> which can be derived from the dislocation forest theory. (3) The flow stress σ_f increases with the excess dislocation density D_b. This relation is expressed by a linear equation σ_f = σ_0 +α'GbD_b^<1/2> which is of the same form as that introduced from the work-hardening theory. (4) The tensile strength is expressed by a linear function of the inverse square root of the sub-grain size t.
社団法人日本材料学会の論文
1978-03-15