J. Japan Inst. Metals, Vol. 15, No. 1 (1951),
pp. 16-20

Abnormal Structure in Alloys of Eutectic or Eutectoid Type (1st Report) Abnormal Structure in Binary Alloys of Eutectic Type

Kyuya Nagasaki

Abstract:

In alloys of eutectic type, abnormal structure or eutectic halo, which is a structure where primary crystals exist in eutectic matrix surrounded by pro-eutectic secondary crystals, appears either in hypo- or in hyper-eutectic alloys. Concerning this abnormal structure various kinds of binary alloys of eutectic type were investigated microscopically to determine abnormal structure appears, in alloy of hypo- or hyper-eutectic composition and it is recognized that it appears in hyper-eutectic alloys if eutectic point S is nearer to P than to K (i.e. PS<SK) on eutectic line PSK and in hypo-eutectic alloys if S is nearer to K than to P (i.e. PS>SK) and that this relations are not affected by the nature of constituents.

(Received 1950/6/30)

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