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研究 Al-Cu(4.3%)合金中第二相(θ′、θ相)对蠕变的影响,蠕变温度为140-190℃(413-463°K),蠕变应力为10-20公斤/平方毫米.结果表明:含θ′相和含θ相的合金的稳定蠕变速度与温度、应力的关系都遵守:ε_=Aexp(-(Uo-ασ)/kT)规律.含θ′相合金的激活能 U_o(θ′)=13600卡/克分子,含θ相合金的激活能 U_o(θ)=36000卡/克分子.温度一定,应力较低时,含θ′相合金的蠕变速度较含θ相合金的小,但应力增加,可能出现相反情况,即存在所谓“转折应力”.蠕变温度增加转折应力增大.认为控制含θ′相合金的蠕变机构是位错切过θ′相.用电子显微镜观察了蠕变后试样的组织.理论上估计了位错切割θ′相所需的激活能.
The effect of the second phase (θ ’, θphase) on the creep in Al-Cu (4.3%) alloys was studied. The creep temperature was 140-190 ° C (413-463 ° K) and the creep stress was 10-20 kg / Mm 2 .The results show that the relationship between the steady creep velocity and the temperature and stress of the alloy containing θ phase and θ phase obeys the rule of ε_ = Aexp (- (Uo-ασ) / kT) The activation energy of the alloy U_o (θ ’) = 13,600 cal / mol, the activation energy of θ-phase alloy is U_o (θ) = 36,000 cal / mol.When the temperature is low and the stress is low, However, the higher the stress, the opposite may occur, that is, there is a so-called “turning stress.” The creep temperature increases and the turning stress increases.It is believed that controlling the creep mechanism containing θ ’phase alloy is dislocation cutting Over θ ’phase.The microstructure of the sample after creep was observed with an electron microscope, and the activation energy required for dislocation θ’ phase was theoretically estimated.