Acta Metall Sin  1990, Vol. 26 Issue (2): 21-25    DOI:

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EFFECT OF Cu ON MICROSTRUCTURE AND PROPERTIES OF Al-Li ALLOYS

YAO Daping;HU Zhuangqi;LI Yiyi;ZHANG Yun;SHI Changxu Institute of Metal Research; Academia Sinica; Shenyang Institute of Metal Research;Academia Sinica; Shenyang 110015

YAO Daping;HU Zhuangqi;LI Yiyi;ZHANG Yun;SHI Changxu Institute of Metal Research; Academia Sinica; Shenyang Institute of Metal Research;Academia Sinica; Shenyang 110015. EFFECT OF Cu ON MICROSTRUCTURE AND PROPERTIES OF Al-Li ALLOYS. Acta Metall Sin, 1990, 26(2): 21-25.

Abstract References Related Articles Recommended Metrics Download:  PDF(2264KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The aging precipitation structure and its properties of the Al-Li-Cu-Zr alloys with 3 different Cu/Li ratios have been studied. Experimental resultsshow that the aging hardening of the alloys consists of two steps: the first is stre-ngthened by δ'-phase (δ'+T_1 phase in alloy No.3), and the second by δ'+T_1 phase(δ'+T_1+θ' phase in alloy No.3). The plate of T_1-phase can absorb the Li atomsfrom δ' particles when the plate bumped into δ"-phase, and therefore, these δ' pha-se particles become smaller and gradually disappear. The strength and hardness areincreased with the increase of Cu/Li ratio which cuased a decrease in plasticity.The crack mode would change from transgranular to intergranular. This is due to theprecipitation of the equilibrium phases contained Cu at grain boundaries. Key words:  Al-Li alloy      aging hardening      microstructure      tensile properties      Received:  18 February 1990      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1990/V26/I2/21 1 Silcock J M. J Inst Met, 1959--60; 88: 357 2 Starke E A Jr., Sanders T H Jr., Palmer I G. J Met, 1981; 33 (8) : 24 3 Huang J C, Ardell A J. J Phys (Paris), 1987; 48 (C3) : 373 4 Cassada W A, Shiflet G J, Starke E A Jr. J Phys (Paris). 1987; 48 (C3) : 397 5 Tosten M H, Vasudevan A K, Howell P R. Metall Trans, 1988; 19A: 51 6 Yao D P, Li Y Y, Hu Z Q, Zhang Y, Shi C X. In: Sanders T H Jr., Starke E A Jr. eds., Aluminum-Lithium Alloys V, Materials Component Engineering Publication Ltd., UK, 1989: 153 [1] GONG Shengkai, LIU Yuan, GENG Lilun, RU Yi, ZHAO Wenyue, PEI Yanling, LI Shusuo. 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