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首页> 外文期刊>Journal of Materials Engineering and Performance >Evolution of Tensile Properties in AA2219 Plates Due to Varying Modes and Percentages of Cold Work before Artificial Aging
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Evolution of Tensile Properties in AA2219 Plates Due to Varying Modes and Percentages of Cold Work before Artificial Aging

机译：AA2219板中拉伸性能的演化由于人工老化前的不同模式和百分比的冷轧百分比

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摘要

Evolution of tensile properties in 8-mm-thick AA2219-T8X plates with the pre-artificial aging (here onward termed pre-age) cold work applied independently by cold rolling and stretching was monitored by tensile tests. It is shown that the desired minimum 0.2% proof stress (0.2% PS) of 352 MPa, ultimate tensile strength of 441 MPa and percentage elongation of 7 in T87 temper could be achieved in the longitudinal direction of the alloy following 6% of pre-age cold work by stretching. However, these minimum tensile properties could be achieved in both longitudinal and long transverse directions following 7% of pre-age cold work independent of the methods by which the cold work is employed. The tensile strength properties subsequently decreased when the percentage of pre-age cold work equaled or exceeded 8%. The coarsening of theta ' (metastable Al2Cu-theta) precipitates caused the decrease in strength. It is further observed that suitable percentages of pre-age cold work involving both cold rolling and stretching not only provide the minimum desired T87 tensile properties but considerably reduce the differences in 0.2% PS values between longitudinal and long transverse directions of the plates. This is discussed in terms of the tendency of the pre-age cold work by stretching to introduce directional properties in the plates.
机译：通过拉伸试验监测用抗拉轧制和拉伸的预先人工老化（这里向前称为预期）冷加工的8mm厚的AA2219-T8X板中的拉伸性能的演变。结果表明，在Pre-of 6％以下的合金之后，在6％的合金的纵向方向上可以实现所需的最小0.2％的352MPa，最终拉伸强度和441MPa的百分比伸长率和7中的百分比伸长率。伸展年龄冷的工作。然而，这些最小拉伸性能可以在纵向和长的横向之后实现在7％的纵向和长的横向上，而无关，其独立于使用冷加工的方法。当预期冷加工的百分比等于或超过8％时，拉伸强度性能随后降低。 θ'（亚稳的Al2Cu-θ）沉淀物的腐蚀性导致强度降低。进一步观察到，涉及冷轧和拉伸的适当百分比的较高的冷加工不仅提供最小所需的T87拉伸性能，但显着降低了板纵向和长横向之间的0.2％PS值的差异。这就是通过拉伸在平板中引入定向性能的前龄寒冷工作的趋势方面讨论。

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