Ti および Ti 合金のイナートガス・アーク溶接に関する研究(第 5 報) : α+β Ti 合金のβ⟶α変態過程について

概要

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As for the β⟶α transformation process in α+β titanium alloy there are little theories. In this investigation, were studied on the process and the mechanism of the β⟶α transformation were made clear. The β⟶α transformation in α+β titanium alloy progresses as following. β_0⟶ω+β_r⟶ω+α+β_r⟶α+β_r (β_r⟶α+β_u) where, β_0,β_r and β_u mean the change of density (composition) of alloying element in β according to the transformation process. This ω is a methodical crystal structure (the structure is b.c.c. and has about three times as large lattice constant as that of original β) which is formed with travelling of the solute atoms so as to form the unit cell which is necessary to the β⟶α transformation. But this ω was seen only in the earlier period of the bigining of α precipitates from β in the β⟶α transformation, and when a little of the transformation progressed on (or in α+β titanium alloys containing a small amount of β-stabilizer), something as ω could not be seen.
社団法人溶接学会の論文
1961-11-25