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对粉末冶金法制备的Mo-30Cu合金板材,在不同工艺条件下进行轧制试验,采用金相显微镜及扫描电镜对轧制变形后的组织进行观察,并采用维氏硬度计对经过不同道次变形量的材料进行硬度测试,研究合金的轧制变形性能及组织演变。研究发现,热轧温度为900℃、变形量达到50%时,板材试样轮廓清晰,Mo颗粒被压扁拉长,呈椭球状,烧结态组织转变为变形组织。总变形量为98%的Mo-30Cu合金箔材组织中,Mo相与Cu相均被压成纤维状,两相成均匀层叠分布,Mo层与Mo层、Mo与Cu层间界面清晰,彼此结合紧密。Mo-30Cu合金的轧制变形行为分为3个阶段:总变形量小于50%时,Mo颗粒在Cu相中滑移及Cu相变形;变形量介于50%～90%时,Mo相和Cu相协调变形;变形量大于90%时,Mo相变形。经热轧变形后的Mo-30Cu合金,当冷轧变形量为0%～25%时,由于加工硬化,维氏硬度呈直线上升;当冷轧变形量大于25%时,随着变形量的增加,钼骨架和铜相逐渐变形形成纤维组织,位错密度的增长趋势逐渐减弱,加工硬化效应也会逐渐低于线性增长规律,同时晶格畸变能增加,产生变形热效应,促使材料中产生回复过程,材料的硬度增加缓慢。
For the Mo-30Cu alloy plate prepared by powder metallurgy method, the rolling test was carried out under different technological conditions, the microstructure of the rolled deformed steel was observed with a metallographic microscope and a scanning electron microscope, and the microstructure of the Mo- The amount of deformation of the material for hardness testing of the alloy rolling deformation and microstructure evolution. The results show that when the hot rolling temperature is 900 ℃ and the deformation amount reaches 50%, the outline of the plate specimen is clear. The Mo particles are flattened and elongated, and are ellipsoidal. The sintered microstructure changes to deformed structure. In the Mo-30Cu alloy foil with the total deformation of 98%, the Mo phase and the Cu phase are both compacted into a fibrous shape, the two phases are uniformly layered and distributed, the interface between the Mo layer and the Mo layer, the Mo layer and the Cu layer is clear, Combine closely. Mo-30Cu alloy rolling deformation behavior is divided into three stages: When the total deformation is less than 50%, Mo particles in the Cu phase and Cu phase deformation; deformation of between 50% to 90%, the Mo phase and Cu phase coordinate deformation; deformation is greater than 90%, Mo phase deformation. When the deformation of hot-rolled Mo-30Cu alloy is 0% ~ 25%, the Vickers hardness rises linearly due to work-hardening. When the amount of cold-rolling deformation is more than 25% The molybdenum skeleton and the copper phase are gradually deformed to form fibrous tissue, the tendency of the dislocation density is gradually weakened, and the work hardening effect is also gradually lower than the linear growth law, meanwhile the lattice distortion can be increased to produce the deformation heat effect and promote the material recovery Process, the hardness of the material increases slowly.