Transactions of Materials and Heat Treatment

Title：Analysis on microstructure and mechanical properties of 7071 aluminum alloy plate for construction beam in differential temperature rolling

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ClassificationCode：TG335.1

year,vol(issue):pagenumber：2019,44(4):171-175

Abstract：

7071 aluminum alloy plate was rolled at differential temperature by spraying emulsion on the surface of plate to realize rapid cooling, and the changes of microstructure and properties of the surface and center of 7071 aluminum alloy plate in conventional rolling and differential temperature rolling were studied by SEM, room-temperature tensile and EBSD methods. The results show that the recrystallized grains grow longer in the rolling direction by both rolling methods, the recrystallization degree decreases gradually from the surface to the interior, and the recrystallization degree of conventional rolling layer is less than that of differential temperature rolling. Furthermore, the insoluble phases at different positions of solid soluble plate obtained by differential temperature rolling have better uniformity, and the size of insoluble phases in the core area is smaller than that of conventional rolling. After differential temperature rolling, the difference of mechanical properties at different positions of plate become smaller and reach a more uniform state. Meanwhile, after differential temperature rolling, the surface elongation of plate increases obviously, but the central part decreases to a certain extent. Thus, the mechanical properties of plate can be improved by differential temperature rolling.

Funds：

山东省高等学校科研发展计划项目（J17KB054）

毕莹莹（1983-），女，硕士，讲师 E-mail：9146633@qq.com

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