本文研究了两种不同量的Ag的加入对自然时效状态Al-Li-Cu—Mg—Zr合金在290—77K温度范围内的拉伸性能及断裂行为的影响。结果表明,随着实验温度的降低,合金的拉伸性能在153—77K之间明显改善,不含Ag合金的延伸率则基本保持不变;所有合金在室温时的变形与断裂模式基本相同,主要为平面滑移引起的穿晶剪切断裂;但低温下的拉伸行为随Ag的加入而表现出不同的特点,即含Ag合金的变形在低温下趋于均匀,其低温延伸率的改善可归因于此;低温下合金分层及沿晶开裂的倾向增加
The tensile properties and fracture characteristics of threeAl-Li-Cu-Mg-Zr(-Ag) alloys in the natural aged temper have been studied over the tem-perature range of 77--290 K. Results show that the tensile strength and ductility of the alloyssignificantly increased with the decrease of test temperature from 153 to 77 K, except theelongation of the alloy free of Ag, which kept nearly constant for the entire temperaturerange. Planar slip behavior and transgranular shear fracture are the predominant mode forthree alloys when testing at room temperature. At cryogenic temperatures, the alloys have atendency to cracking along grain boundaries, and show different tensile behavior, i.e., theoverall deformation distribution looks fairly uniform for the alloys containing Ag, in whichthe increase of cryogenic ductility may be attributed to the homogeneous deformation.
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