This work investigated crystallographic textures and the features of a flow localization band in a forged Ti6242S billet. The flow localization band experienced a large strain and grains within it were elongated under shear stress. The main macrotextural components were made up of (11 2 ¯ 0)/<10 2 ¯ 0>, <0002>/axial direction, and a static recrystallization texture (11 2 ¯ 0)/(3 3 ¯ 02), which can be explained by motion of a prismatic <a> slip system and a newly proposed method of projection. Finally, three types of macrozone, each with a sharp defined texture were observed and subsequently, it was demonstrated that the formation of macrozones was only connected with parameters of thermomechanical processing and was independent of variants selection.
The all-day star sensor can complete the star detection throughout the day to solve the problem that the sky signal is overwhelmed due to excessive sky background radiation during the daytime. In this paper, a comprehensive analysis of the status quo of the all-day star sensor is presented, and the technical indicators of the typical all-day star sensor at home and abroad are introduced. In order to improve the detection ability of daytime stars, based on the factors affecting the detection performance of star sensors throughout the day, short-wave infrared technology is used to detect weak star signals. The small field of view lens design is adopted, and the hood in the optical system is optimized to achieve an extinction ratio of 8.65×10−6. Low-contrast star map processing is performed using spectral filtering methods. The target of daytime stargazing is achieved.
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