The Relationship between the Existence of Brittle Phase Surrounding Ductile Phase and Mechanical Properties

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  • Ueda Shoji
    Labolatory Mitsubishi Shipbuilding & Engineering Co. Ltd.
  • Zama Masato
    Labolatory Mitsubishi Shipbuilding & Engineering Co. Ltd.

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  • 延性相が脆硬相で囲まれた場合の機械的性質
  • エンセイソウ ガ ゼイコウソウ デ カコマレタ バアイ ノ キカイテキ セイシツ

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In Cu-Al alloy systems, segregation occurs due to the transformation of β→α in the process of cooling,because β⁄(α+β) and (α+β)⁄α solubility curves are located just at the limits of solidification range, and the diffusion of solute atoms in α phase is more difficult to occur than in matrix β phase. Even in an alloy that consists of α mono phase in equilibrium state, (α+δ) eutectoid precipitates in the grain boundary of α phase.<BR>Using the phenomenon of this segregation, a series of alloys which satisfies the following conditions can be obtained: (1) The α-grain size remains uniform. (2) α-path in the eutectoid is constant, and (3) The length fraction of α⁄(α+δ) boundary varies. In this paper, the effects of existence of a brittle phase surrounding the ductile phase on the mechanical properties were investigated by using the alloys which were treated under the abovementioned conditions. The experimental results strictly satisfied the following formula: σ_s = σ_o + K’ [{(γ_1 - γ_2)/d}f + γ_2/d]^1/2 where, σs is the yield strength, σo is the back stress of dislocations, d is α grain size, γ1 and γ2 are measures of the strength of α⁄(α+δ) boundary and α⁄α boundary, respectively, f is the length fraction of brittle phase boundary, and K′ is constant.

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