Effects of Pre-rolling Aging on Structure and Mechanical Properties of 2055 Al-Li Alloy
Effects of different pre-rolling deformations and aging on microstructure and mechanical properties of 2055 Al-Li alloy in solid-solution state were investigated.The results indicate that the pre-rolling deformation before aging can significantly shorten the peak aging time and improve the hardness and strength of the alloy.When the pre-rolling deformation amount is 0,3%and 10%,the peak hardness of 2055 Al-Li alloy at 155℃reaches 207.66 HV,215.31 HV and 220.07 HV aging for 40 h,30 h and 28 h,respectively.The yield strength and tensile strength of the alloy after 10%pre-rolling + 155 ℃×28 h peak aging reach 562.64 MPa and 622.04 MPa,which are 67%,21%and 43%,8%higher than those of peak aging alloy without pre-rolling and 3%pre-rolling,respectively.The enhancement in mechanical properties is attributed to high-density dislocations induced by plastic deformation,promoting uniformly dis-persed precipitation of large amounts of phases.
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