在820和900℃对Ni36CrTiAl弹性合金进行时效处理,并对其进行拉伸实验,利用金相显微镜、XRD及SEM等手段对处理前后试样的组织结构和断口特征进行了分析表征。结果表明,时效处理前Ni36CrTiAl合金主要以 Ni3(Cr,Al)相为主,断口主要表现为脆性断裂特征。820℃时效后析出了一定数量的 Ni3(Ti,Al)第二相,主要分布在晶界上,断口出现了一定数量的韧窝。900℃时效后,第二相的数量增加,且弥散分布于晶内,断口为韧性断裂特征。
In this paper,the Ni36CrTiAl elastic alloy was aged at 820 and 900 ℃ respectively,and a tensile test was carried on the sample before and after aging.The microstructure and fracture characteristics of Ni36CrTiAl elastic alloy were investigated through microscope observation,SEM analysis,and XRD analysis.Results show that the main phase of Ni36CrTiAl alloy was Ni3(Cr,Al)and the fracture was brittle before aging.A certain amount of Ni3(Ti,Al)phase occurred on the grain boundary of Ni36CrTiAl alloy after aging at 820 ℃,and meanwile a certain amount of dimples appeared on the fracture.The second phase increased and dispersed inside grains after aging at 900 ℃ and the fracture showed ductile fracture characteristics.
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