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目前的铝—锂合金,虽然密度比常规的铝合金低,但在同样的强度条件下,却很少能有与之相对应的韧性。这一缺陷阻碍了铝—锂合金对常规铝合金的取代。最近研制出的4种有专利权的铝—锂合金,是想使其具有较高的抗应力腐蚀断裂(SCC)性能。在相似的强度条件下,它们也具有比工业用铝—锂合金或常规铝合金高得多的抗冲击能力。初步实验表明,这些合金的短的横切口(L-S切口)处断裂韧性和抗SCC性能与工业用铝—锂合金相比均有所提高。预计这种可能获得的突破会有助于航空航天工业中铝—锂合金对常规2000和7000系列铝合金的取代。
The current aluminum-lithium alloys, although less dense than conventional aluminum alloys, have seldom had the same toughness under the same strength conditions. This defect hindered the substitution of aluminum-lithium alloys for conventional aluminum alloys. The four patented aluminum-lithium alloys recently developed are intended to provide high SCC resistance. They also have much higher impact resistance than industrial aluminum-lithium alloys or conventional aluminum alloys under similar strength conditions. Preliminary experiments show that the fracture toughness and SCC resistance at short cross-cuts (L-S cuts) of these alloys are all improved compared to those of industrial aluminum-lithium alloys. This potential breakthrough is expected to contribute to the substitution of aluminum-lithium alloys for conventional 2000 and 7000 series aluminum alloys in the aerospace industry.