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首页> 外文期刊>Transactions of Nonferrous Metals Society of China >Material constants of an Al-Li-Cu-Mg-Zr alloy during deformation at elevated temperatures
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Material constants of an Al-Li-Cu-Mg-Zr alloy during deformation at elevated temperatures

机译：Al-Li-Cu-Mg-Zr合金高温变形时的材料常数

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摘要

The hot deformation behaviors of an 2091 Al-Li-Cu-Mg-Zr alloy have been investigated by high temperature isothermal compression testing. The material constants of the alloy, including deformation activation energy △H as 162.5 kJ/mol, stress-level coefficient α as 0.0397 mm~2/N, stress exponential n as 2.647 and structural factor A as 2.74 × 10~10 s~-1 are derived by both graphic representation method and mini- mized deviation criterion from the interdependencies of flow stress, strain rate and temperature. That the de- formation activation energy of the 2091 alloy is higher than the self-diffusion activation energy of pure alumini- um for high temperature creep and the activation energy of most other commercial aluminium alloys can be at- tributed to the alloying of copper and magnesium.
机译：通过高温等温压缩试验研究了2091 Al-Li-Cu-Mg-Zr合金的热变形行为。合金的材料常数包括变形激活能△H为162.5 kJ / mol，应力水平系数α为0.0397 mm〜2 / N，应力指数n为2.647，结构因子A为2.74×10〜10 s〜-图1是通过图形表示法和最小偏差准则从流动应力，应变率和温度的相互依赖关系得出的。 2091合金的变形激活能高于纯铝的高温扩散自扩散激活能，而大多数其他商用铝合金的激活能可归因于铜和铝的合金化。镁。

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