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通过X射线衍射(XRD)和透射电镜(TEM)研究Cu-20Ni-20Mn合金在450°C时效过程中的显微组织及相转变,并对时效后合金的抗拉强度、屈服强度和硬度进行分析。结果表明,时效开始阶段存在一个很长的孕育期,此时合金的强度和硬度没有明显变化。随着时效时间的延长,有序的面心四方结构(FCT)NiMn相在晶粒中形核并长大。随着有序FCT结构相尺寸的增加,合金硬度和强度提高并达到极大值。在450°C时效40h后合金强度达到942 MPa。由有序FCT结构NiMn相所产生的沉淀强化是合金主要的时效强化因素。
The microstructure and phase transition of Cu-20Ni-20Mn alloy during aging at 450 ° C were studied by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The tensile strength, yield strength and hardness of the alloy after aging analysis. The results showed that there was a long period of gestation in the initial stage of aging, at which point the strength and hardness of the alloy did not change significantly. With the extension of the aging time, ordered face-centered tetragonal structure (FCT) NiMn phase nucleates and grows in the grains. As the size of the ordered FCT structure increases, the hardness and strength of the alloy increase and reach the maximum value. The alloy strength reached 942 MPa after aging at 450 ° C for 40h. Precipitation strengthening produced by an ordered FCT structure NiMn phase is the main aging strengthening factor of the alloy.