Aging of Cu-3 at% Ti Alloys in Hydrogen Atmosphere: Influence of Hydrogen Pressure on Strength and Electrical Conductivity
Aging of Cu-3 at% Ti Alloys in Hydrogen Atmosphere: Influence of Hydrogen Pressure on Strength and Electrical Conductivity
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DOI：
10.2320/matertrans.d-ma201031
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发表时间：
2011-04
影响因子：
1.2
通讯作者：
S. Semboshi;T. Nishida;H. Numakura
中科院分区：
文献类型：
--
作者：
S. Semboshi;T. Nishida;H. Numakura
在0~0.8 Mpa的氢气压力范围内，研究了等温时效过程中氢气压力对Cu3at%Ti合金机械强度、电导率和显微组织的影响。在氢气压力下老化的所有样品的硬度随时效时间的变化没有显著差异。这是因为硬度的提高主要是通过Cu4Ti颗粒的析出强化来实现的，氢气压力对硬度的影响较小。在较高的氢气压力下时效，由于TiH2的形成加速，固溶于基体中的钛浓度迅速降低，电导率的提高更为显著。在最高氢压下，773和723K时效样品的峰值硬度电导率比真空时效样品提高了约1.4倍。因此，高氢压力下的时效有助于显著提高强度和电导率。
The influence of hydrogen pressure during isothermal aging on the mechanical strength, electrical conductivity, and microstructure of Cu3 at% Ti alloys was investigated under various hydrogen pressures from 0 to 0.8 MPa. The variation of hardness with aging time was not significantly different among all specimens aged under the hydrogen pressures. This is because the hardness is improved primarily by the precipitation strengthening of Cu4Ti particles, which is less affected by hydrogen pressure. The electrical conductivity increased more significantly for specimens aged under higher hydrogen pressure, due to a rapid reduction in the concentration of Ti dissolved in the matrix, which is attributed to the accelerated formation of TiH2. The conductivity at peak-hardness was improved by a factor of approximately 1.4 in the specimens aged at both 773 and 723 K under the highest hydrogen pressure, compared to that for the specimen aged in vacuum. Therefore, aging under high hydrogen pressure assisted in the significant improvement of both strength and electrical conductivity.