一方向凝固したInSb-MnSb共晶合金の組織
1973 年 37 巻 9 号 p. 964-968
詳細
1973 年 37 巻 9 号 p. 964-968
An eutectic alloy of InSb-MnSb has been unidirectionally solidified at various rates of solidification in order to investigate the structure change due to the solidification condition.
The results obtained are as follows:
(1) The spacing λ between the MnSb rods was expressed to be linear to R−1⁄2, where R is the rate of solidification, and λ2R was 1.50×10−10 em3/sec.
(2) The alloy specimens consisted of polycrystalline columnar grains which elongated to the solidification direction. The crystallographic orientation relationship between the InSb and MnSb phases was determined by X-ray diffraction. A preferred relationship observed can be stated approximately:
Growth direction: ⟨110⟩InSb\varparallel⟨0001⟩MnSb
Coherent interface: {110}InSb\varparallel{10\bar10} or {11\bar20}MnSb
(3) The phase interface energy between the InSb and MnSb phases was determined from a dislocation model considering the mismatch at the interface and equal to 1.18×103 erg/cm2. Assuming that the crystal growth followed Jackson’s model, and also using this phase boundary energy, the diffusion coefficient was evaluated as D=1.5×10−5 cm2/sec.
