Zrを添加したTiAl相の結晶構造と硬さ

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タイトル別名
  • Crystal Structure and Hardness of TiAl Phase Containing Zirconium
  • Zr オ テンカシタ TiAlソウ ノ ケッショウ コウゾウ ト カタサ

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抄録

The composition, crystal structure and hardness of TiAl(γ) phase contained in Ti-48-54 at%Al-0-12 at%Zr alloys annealed for 1 week at 1273 K have been studied. Obtained results are as follows: Soluble Zr atoms enter only into the Ti-sites of sublattice and increase only the a value of the lattice parameters, while, an increase of Al content increases only the c value. These anisotropic effects of the elements on the lattice parameters are attributed to the fact that covalent-like bonds are formed between the Ti atom layer and the Al layer. A region of a high degree of order shifts from (Ti1−xZrx)Al to Ti-rich side on the high Zr side. This cause is considered to be that Ti atoms play the same role as Al in the high Zr phase. A region of a low degree of order is located on the high Zr and high Al side, which is attributed to the existence of a degenerated ternary compound. The hardness depends not on the axial ratio c⁄a but on the degree of order. The solution hardening by Zr is observed only when the amount of the addition is small.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 51 (4), 278-284, 1987

    公益社団法人 日本金属学会

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