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1Introduction Al-Li alloys,compared with traditional Al alloys,possess more excellent properties,such as lower density,greater elastic modulus and higher specific strength.In the near future,they would be widely applied in airplane structures.However,they… 相似文献
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To clarify the localized corrosion mechanism associated with precipitates containing Mg in Al alloys, the simulated bulk precipitates of S and β were synthesized through melting and casting. Their electrochemical behaviors and coupling behaviors with α(Al) in NaCl solution were measured. Meanwhile, simulated Al alloys containing S and β particles were prepared and their corrosion morphologies were observed. It's found that there exist two kinds of corrosion mechanisms associated with precipitates containing Mg. The precipitate of β is anodic to the alloy base, resulting in its anodic dissolution and corrosion during the whole corrosion process. While, there exists a corrosion conversion mechanism associated with the S precipitate, which contains active element Mg and noble element Cu simultaneously. At an initial stage, S is anodic to the alloy matrix at its periphery and the corrosion occurs on its surface. However, during its corrosion process, Mg is preferentially dissolved and noble Cu is enriched in the remnants. This makes S become cathodic to a(Al) and leads to anodic dissolution and corrosion on the alloy base at its periphery at a later stage. 相似文献
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在Gleeble-1500热模拟机上,采用高温等温压缩,在应变速率为0.001~10 s-1和变形温度为300℃~500℃条件下对5052铝合金的流变应力行为进行了研究。结果表明:在应变速率为0.1 s-1(变形温度为420℃~500℃)以及应变速率为0.01和0.001(变形温度为300℃~500℃)时,5052铝合金热压缩变形出现了明显的峰值应力,表现为连续动态再结晶特征;在其他变形条件下存在较为明显的稳态流变特征。可采用Zener-Hol-lomon参数的双曲正弦函数来描述5052铝合金高温变形时的流变应力行为;在获得的流变应力σ解析表达式中A、α和n值分别为12.68×1011s-1,0.023MPa-1和5.21;其热变形激活能Q为182.25 kJ/mol。 相似文献
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