Abstract
Revealing the recrystallization behavior and mechanism of this new alloy is of great significance to subsequent research. In this study, the Ni-36.6W-15Co ternary medium heavy alloy was solution-treated at 1100–1200 °C for different lengths of time. The grain size change, microstructure and texture evolution as well as twin development during recrystallization annealing were analyzed using SEM, EBSD and TEM techniques. The study found that complete recrystallization occurs at 1150 °C/60 min. In addition, it takes a longer amount of time for complete recrystallization to occur at 1100 °C. The value of the activation energy Q1 of the studied alloys is 701 kJ/mol and the recrystallization process is relatively slow. By comparing the changes of microstructure and texture with superalloys, it is found that the recrystallization mechanism of the studied alloy is different from that of the superalloy. The development of annealing twins has a great influence on the recrystallization behavior and mechanism. The results show that the twin mechanism is considered as the dominant recrystallization mechanism of the studied alloy, although the formation and development of sub-grains appear in the early stage of recrystallization.
Highlights
Due to their excellent properties, such as high strength, high plasticity and toughness, heavy alloys with higher density (16–18 g/cm3 ) are widely used in aviation, aerospace, weapons, naval ships and other military industries, and are widely used in machinery, electrical appliances, instruments, metallurgy and other civil industries [1,2,3]
80–98 wt% tungsten, and a small amount of other elements (Fe, Ni, Cu), and they can be considered a composite material in which the hard body-centered cubic (BCC) tungsten spherical body is bonded by a ductile face-centered cubic (FCC) matrix [4,5]
Understanding therelationship relationshipbetween betweenthe the twin and recrystallization a critical toward application. It can be seen from the macrostructural observations shown above that step toward application
Summary
Due to their excellent properties, such as high strength, high plasticity and toughness, heavy alloys with higher density (16–18 g/cm3 ) are widely used in aviation, aerospace, weapons, naval ships and other military industries, and are widely used in machinery, electrical appliances, instruments, metallurgy and other civil industries [1,2,3]. Plasticity has always been a problem troubling WHAs, which means that it is difficult to improve the properties of WHAs through deformation [6,7,8] and grain refinement [9,10]. Developed a new type of nickel-tungsten based FCC alloy with a density that meets the requirements in some critical fields (~11.39 g/cm3 ), which is called a medium heavy alloy (MHA). MHAs have the same or better properties as WHAs. It is worth noting that due to the improvement in plasticity, the deformation strengthening ability of MHAs is very strong, meaning that the material can store a large amount of distortion energy, which is conducive to the formation of fine equiaxed grains during recrystallization, further improving the mechanical properties of the alloy. Revealing the recrystallization mechanism of these alloys can provide a theoretical basis for the subsequent development of these new alloys
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