通过 OM、SEM、XRD 和 TEM 对热处理态 Ti-6Al-4V-2Cr-1.5Mo-xY(x=0.1,0.5,1.0,1.5,质量分数)合金的组织和力学性能进行分析,发现添加稀土 Y元素后,合金的组织得到了明显的细化,产生的稀土氧化物Y2O3弥散分布在基体中;且当Y元素的添加量为0.5％时,合金的强度、硬度和伸长率最好,性能最优.对热处理态的Ti-6Al-4V-2Cr-1.5Mo-0.5Y进行分析,发现析出相Y2O3与基体α-Ti之间的错配度为0.141 3,属于半共格界面.
Effect of Y Addition on Microstructure and Mechanical Properties of Ti-6Al-4V-2Cr-1.5Mo Alloy
The microstructures and mechanical properties of Ti-6Al-4V-2Cr-1.5 Mo-xY(x=0.1,0.5,1.0,1.5,mass frac-tion)alloys are analyzed by means of OM,SEM,XRD,and TEM.It is found out that the microstructures of Ti-6Al-4V-2Cr-1.5 Mo-xY alloys are refined obviously after adding the rare earth Y element,that the Y2O3 phases formed are dispersed in the matrix,and that the mechanical properties of the alloy increase first and then decrease with the increase of the content of rare earth Y.The strength,hardness,elongation and properties of the alloy are the best when the addition of Y element is 0.5％.The mismatch between Y2O3 and the matrix α-Ti of the annealed Ti-6Al-4V-2Cr-1.5 Mo-0.5 Y is 0.141 3,which belongs to semi-coherent interface.
Ti-6Al-4V-2Cr-1.5Mo alloyrare earth Y elementmechanical propertiesnucleation process
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