首页|The role of primary alpha grains in the degree of transformation texture obeying the Burgers orientation relationship in Zr alloys
The role of primary alpha grains in the degree of transformation texture obeying the Burgers orientation relationship in Zr alloys
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NSTL
Elsevier
The microstructure and texture evolution of Zr-xNb-0.4Mo (x = 0, 0.2, 0.4, 0.6 and 1.0 wt%) alloys are characterized using scanning electron microscopy (SEM), transmission electron microscope (TEM) and electron backscatter diffraction (EBSD) technique. The aim is to elucidate the role of primary alpha grains in the degree of transformation texture obeying the Burgers orientation relationship (OR) in Zr alloys. The primary alpha grain is produced by adjusting Nb content in Zr alloys. The crystallographic orientations of Zr-xNb-0.4Mo alloys show that the degree of transformation texture obeying the Burgers OR increases with the proportion of primary alpha grains decreasing. Until no primary alpha grains exist, the transformation texture obeys the Burgers OR strictly. The primary alpha grains can exert great influence on variant selection by restricting the growth of high-temperature beta grains and acting as nucleation sites. The fact that primary alpha grains are the origins of variant selection is observed. Meanwhile, variant selection occurs in both the duplex microstructure and full martensite plates during the water-quenching process. The texture weakening of the duplex microstructure is attributed to the new texture components given by martensite plates. In terms of microstructure, a series of precipitates, Zr3(Nb, Mo, Fe), are found in a primary alpha grain.
NSTL
Elsevier
