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对于承受拉应力的板材,只有改革结构设计,即胶接夹层极和多层板力案能提高疲劳设计应力时,才有可能用常规方法生产的7000系合金(特别是7475合金)来代替2000系合金.但是这些设计方案多半只限于使用在载荷密度相当高的部位.做高强度厚截面抗应力腐蚀性能好的构件,7075合金显然是可胜任的.但对于疲劳性能十分重要的场合,对材料还不能做出确切的选择,部分原因是疲劳性能的数据有限.在合金发展方面,7000系粉末冶金合金在做高强度抗应力腐蚀部件则具有很大潜力,尤其在要求高疲劳强度时更是如此.形变热处理(TMT)能提高强度、断裂韧性和抗应力腐蚀性能,但与常规方法生产的新合金相比,其优越性并不明显.疲劳强度能否提高是TMT能否用于工业生产的关键.
For sheets subjected to tensile stress, it is only possible to replace the conventional 7000 series alloys (especially the 7475 alloys) with the conventional method only if the structural design of the reform, namely the gluing of the laminated layers and the multilayered sheets, increases fatigue design stress However, these designs are mostly limited to the use of the load density is very high parts do high-strength thick cross-section of the anti-stress corrosion resistance of the components, 7075 alloy is obviously competent, but the fatigue performance is very important occasions, The material can not make the exact choice, due in part to limited data on fatigue properties. 7000 alloy powder metallurgy has great potential for high-strength stress corrosion-resistant components in alloy development, especially when high fatigue strength is required (TMT) can improve the strength, fracture toughness and stress corrosion resistance, but its superiority is not obvious compared with the new alloy produced by the conventional method.Whether the increase of the fatigue strength can TMT be used in the industry The key to production.