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首页> 外文期刊>Journal of Materials Engineering and Performance >Mechanical Properties and Microstructure Evolution During Bending-Unbending Deformation of Pure Titanium Sheet
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Mechanical Properties and Microstructure Evolution During Bending-Unbending Deformation of Pure Titanium Sheet

机译：纯钛板弯曲不弯曲变形过程中的机械性能和微观结构演变

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摘要

In this study, the pure titanium sheets with thickness of 1 mm are deformed 1-5 times in the form of bending-unbending cyclic deformation. The bending angles before and after unbending are 120A degrees and 180A degrees, respectively. Mechanical properties of samples during cyclic deformation, including -surface strain curve and spring back in each bending cycle, have been investigated. Moreover, the twinning/detwinning behavior and texture evolution in three typical bending layers (i.e., the tensile layer, neutral layer and compressive layer) in cyclic deformation have been tested by EBSD and TEM, and analyzed systematically. The results indicate that the most intensive twins, consist of similar proportion of tensile and compressive ones, distribute in the inner layer after 1st bending. While they disappear almost entirely after 1st unbending. The twins in outer layer could also be detwinned, and the new twins could be activated during 1st unbending. Besides, the twin density increases obviously and the residual twins could not be detwinned clearly after multiple passes of cyclic deformation. Moreover, the Schmid factor along the direction functions in the activation of twin variants regardless of the three-direction stress states.
机译：在该研究中，厚度为1mm的纯钛板以弯曲的环状变形的形式变形1-5次。不均匀之前和之后的弯曲角度分别为120A度和180A度。研究了在循环变形期间的样品的力学性能，包括在每个弯曲循环中的表面应变曲线和弹簧回来。此外，通过EBSD和TEM测试了三种典型弯曲层（即，，抗拉层，中性层和压缩层）的三个典型弯曲层（即，拉伸层，中性层和压缩层），并系统地分析。结果表明，最强烈的双胞胎，由类似的拉伸和压缩性比例组成，在第一弯曲后分布在内层。虽然它们在第一次不平衡之后几乎完全消失。外层中的双胞胎也可以扭转，并且在第1期间可以激活新的双胞胎。此外，双密度明显增加，并且在循环变形的多次通过后，残留的双胞胎不能清楚地纠正。此外，无论三方向应力状态如何，沿着双变型的方向发作的施密因子。

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