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采用快速凝固法制备了Ti53.5Ni22.8Cu23.7合金薄带,对快速凝固合金条带在不同温度下退火热处理态的微观结构进行了X射线衍射和TEM分析。结果表明,在450℃退火处理时,合金组织为B19、B2和条状析出物共存,条状析出物与基体呈共格关系,宽约为10~15nm;500℃退火以后形成纳米多晶B19和单晶B19的混合组织;Ti2(Ni+Cu)析出物在高于550℃以上温度退火时形成,其晶粒尺寸随温度升高长大,板条宽由30~50nm变化到200~300nm;在650℃退火态下,Ti2(Ni+Cu)晶粒进一步长大并影响马氏体的形貌,局部区域高密度晶界相互叠加形成莫尔条纹。
Ti53.5Ni22.8Cu23.7 alloy ribbons were prepared by rapid solidification method. The microstructures of the rapidly solidified alloy ribbons annealed and annealed at different temperatures were characterized by X-ray diffraction and TEM. The results show that the microstructure of the alloy is B19, B2 and strip precipitates coexist when annealed at 450 ℃. The strip precipitates have a coherent relationship with the matrix and have a width of about 10-15 nm. After annealed at 500 ℃, nano-poly B19 And single crystal B19. Ti2 (Ni + Cu) precipitates were formed when the temperature was above 550 ℃. The grain size increased with the increase of temperature, and the width of strip varied from 30 ~ 50nm to 200 ~ 300nm In the annealed state at 650 ℃, Ti2 (Ni + Cu) grains grow further and affect the morphology of martensite. The high-density grain boundaries in the local regions are superimposed to form Moire fringes.