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首页> 外文期刊>Journal of Materials Engineering and Performance >Effects of Pre-stretching and Aging Treatments on Microstructure, Mechanical Properties, and Corrosion Behavior of Spray-Formed Al-Li Alloy 2195
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Effects of Pre-stretching and Aging Treatments on Microstructure, Mechanical Properties, and Corrosion Behavior of Spray-Formed Al-Li Alloy 2195

机译：预拉伸和老化处理对喷雾形成的Al-Li合金的微观结构，机械性能和腐蚀行为的影响2195

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摘要

In this study, different pre-stretching and aging processes were applied to spray-formed Al-Cu-Li alloy 2195. The effects of different processes on the microstructures, mechanical properties, and corrosion behaviors of the alloy were examined. The strengthening and corrosion mechanisms were investigated. The samples treated with pre-stretching and aging have higher strength than the only aged samples. However, the strength is not significantly improved with the increase in the amount of pre-stretching. The pre-stretching treatment can suppress the formations of grain boundary precipitates (GBPs) and precipitate-free zones (PFZ), and the intergranular corrosion (IGC) sensitivity of the alloy is therefore reduced. The increase in pre-stretching promotes massive precipitation of theT(1)phase, which leads to the negative shift of open-circuit potential. The over-aging treatment after pre-stretching leads to the growth of the PFZ and GBPs as well as the coarsening of theT(1)phase. These changes in microstructure cause a decrease in mechanical properties and the re-sensitivity to the IGC. Under the same pre-stretching deformation, the two-step aging treatment (110 degrees C/12 h + 160 degrees C/24 h) can result in more intensive precipitation of theT(1)phase, which enhanced the strength to a higher level. Meanwhile, the two-step aged alloy was immune to the IGC. The evolution mechanism of IGC for the alloy with different pre-stretching and aging processes was proposed based on the TEM characterization and the observation of IGC morphology.
机译：在本研究中，不同的预拉伸和时效工艺被应用于喷射成形的Al-Cu-Li合金2195。研究了不同工艺对合金组织、力学性能和腐蚀行为的影响。研究了其强化和腐蚀机理。经过预拉伸和老化处理的样品比仅经过老化处理的样品具有更高的强度。然而，随着预拉伸量的增加，强度没有显著提高。预拉伸处理可以抑制晶界析出物（GBPs）和无析出区（PFZ）的形成，从而降低合金的晶间腐蚀（IGC）敏感性。预拉伸的增加促进了theT（1）相的大量沉淀，从而导致开路电位负移。预拉伸后的过时效处理导致PFZ和GBPs的生长以及theT（1）相的粗化。这些微观结构的变化会导致机械性能的降低和对IGC的再敏感性。在相同的预拉伸变形条件下，两步时效处理（110℃/12h+160℃/24h）可使theT（1）相析出更强烈，从而将强度提高到更高的水平。同时，两步时效合金对IGC免疫。通过TEM表征和IGC形貌观察，提出了不同预拉伸和时效工艺下合金IGC的演变机制。

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