日本金属学会誌

J. Japan Inst. Metals, Vol. 16, No. 7 (1952),
pp. 361-365

A Study on the Two Phase Alloys by Cold Rolling

Genjirô Mima and Shigenori Hori


Abstract:

Generally, the industrial alloys consist of several phases, for example, as solid solution, intermetallic compound and non metallic inclusion. Therefore, the deformation process of those alloys by rolling differs from that of alloys with homogeneous structure, and then the internal stresses occur. We studied the deformation process of the 2nd phase due to rolling on Cu-Zn, Cu-Sn, Cu-Al and Sn-Sb alloys of composition with two phases. The experiments have been described by statistical methods using a microscope.
The results obtained are as follows: in alloys consisting of a softer or a harder 2nd phase with the matrix, a softer 2nd phase undergose greater deformation than the matrix and a harder one tends to deform less than the matrix. The rolling goes forward leading to a similar behavior is flow strength of the both phases with progressive reduction. The following equation which corrected Unckel's formula contained these experiments, hΔ h / HΔ H=Q1-Vi/Vm, where Δ h/h is the deformation degree of the 2nd phase, Δ H/H the average percentage reduction of the test-piece, Vi/Vm the relative hardness of the both phases and a is obtained by the experiment, and in our investigation a is 3.0. If the 2nd phase particle has an irregular shape, the flow of the matrix is disturbed remarkably and the defect of the material shows a tendency to increase with rolling.


(Received 1952/3/18)

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