On the aluminum-tantalum system
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概要
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The phase equilibria in the aluminum-tantalum system were studied by metallography, X-ray analyses and melting point measurement techniques. There are two intermediate phases in this binary system and they were identified as TaAl3 and Ta2Al. The TaAl3 phase is tetragonal structure of TiAl3 type and the lattice parameters are a = 5.432Å, c = 8.580Å and c/a = 1.579. The TaAl3 phase has an extensive range of solubility at elevated temperatures, ranging from 22at.%Ta to 32at.%Ta. The Ta2Al phase is tetragonal structure of β-U type and the lattice parameters are a = 9.971Å, c = 5.127Å and c/a = 0.514.The TaAl3 phase forms congruently from a melt at 1550° ±50°C and the Ta2Al phase forms peritectically at 2000° ±50°C. An eutectic reaction occurs at about 42at.%Ta and 1500° ±50°C between TaAl3 and Ta2Al. In the tantalum rich region of this system, a peritectic reaction occurs at 2000° ±50°C where liquid reacts with a tantalum solid solution to form Ta2Al. The aluminum solid solution forms peritectically at 668°C between liquid and TaAl3. The tantalurm solid solution crystallized out as a primary phase and the maximum solubility of aluminum in the tantalum solid solution is about 12at%Al at the peritectic temperature of 2000° ±50°C and abruptly decreases with decreasing temperatures.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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