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首页> 外文期刊>Materials Science and Engineering >Characterisation of microstructural damage evolution during tensile deformation of a near-α titanium alloy: Effects of microtexture
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Characterisation of microstructural damage evolution during tensile deformation of a near-α titanium alloy: Effects of microtexture

机译：近α钛合金拉伸变形过程中微结构损伤演变的表征：微观结构的影响

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摘要

The evolution of microstructural damage during tensile deformation of a near-α titanium alloy has been characterised using nonlinear ultrasonic (NLU) parameters. Evolution of the damage state in the interrupted tensile specimens at different strain levels has been correlated with the second-order (NLU) parameter. It is shown that the second-order ultrasonic parameter does not change monotonically with increasing strain. The variation in (NLU) parameters is shown to be a function of both the density of dislocation substructure and the preferred crystallographic orientations that evolve during tensile deformation. The presence of microtexture predominantly affects the harmonics generation from the dislocation substructure. A physical basis for the above observation has been established using a dislocation string vibration model. Infrared thermal imaging has been used to map the evolution of damage along the gauge length of the specimens to take into account the in-homogeneities of deformation.
机译：使用非线性超声（NLU）参数表征了近α钛合金拉伸变形过程中微结构损伤的演变。断裂状态下拉伸试样在不同应变水平下的损伤状态演变已与二阶（NLU）参数相关。结果表明，二阶超声参数不会随应变的增加而单调变化。 （NLU）参数的变化显示为位错亚结构的密度和拉伸变形过程中演化出的首选晶体学取向的函数。微观纹理的存在主要影响位错子结构产生的谐波。已经使用位错弦振动模型建立了上述观察的物理基础。考虑到变形的不均匀性，红外热成像已被用于绘制沿标距长度的损伤演变图。

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