Investigation on Ultrasonic Vibration Effects on the Plastic Flow Behavior of Ti2AlNb Alloy: Johnson–Cook Model
Investigation on Ultrasonic Vibration Effects on the Plastic Flow Behavior of Ti2AlNb Alloy: Johnson–Cook Model
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超声振动对 Ti2AlNb 合金塑性流动行为的影响研究：Johnson-Cook 模型
DOI：
10.1007/s11665-022-07670-y
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发表时间：
2022-12
影响因子：
2.3
通讯作者：
Ping Li
中科院分区：
文献类型：
--
作者：
Kemin Xue;Shenghua Guo;Xiaohu Ji;Miao Meng;Ping Li
在过去的十年中，超声振动辅助技术在金属成形中得到了广泛的研究。然而，超声辅助成形Ti2AlNb合金的研究尚未见报道。为了研究Ti2AlNb合金在超声辅助成形过程中的流动行为，建立能够准确描述其流动行为的本构模型，对超声幅值为0~31µm、应变速率为0.001~0.125−1的Ti2AlNb合金进行了室温压缩试验。考虑屈服强度、应变硬化和应变率硬化效应的影响，提出了一种修正的Johnson-Cook(J-C)本构模型，该模型能够准确描述Ti2AlNb合金在超声辅助压缩过程中的流动行为。结果表明，在所研究的变形条件下，Ti2AlNb合金的屈服强度和应变硬化系数随超声振幅的增大而减小。当振幅增加到31微米时，屈服强度下降了42%。超声提供了更大的位错运动能，增加了位错的活性，减缓了位错的堆积，从而降低了屈服强度。应变硬化指数和应变速率硬化系数随振幅的增大而增大。对优化后的J-C模型进行了定量分析，结果表明，预测结果与实验数据吻合较好。
Ultrasonic vibration (UV)-assisted technology has been widely investigated in metal forming in the past decade. However, the research on ultrasonic-assisted forming of Ti2AlNb alloy has not been reported. To study the flow behavior of Ti2AlNb alloy during ultrasonic-assisted forming and set up the constitutive model that can accurately describe its flow behavior, the room temperature compression test of Ti2AlNb alloy with ultrasonic amplitude range of 0-31 µm and strain rate of 0.001-0.125 s−1were carried out. Considering the influence of yield strength, strain hardening and strain rate hardening effect, a modified Johnson–Cook (J–C) constitutive model is proposed, which can accurately describe the flow behavior of Ti2AlNb alloy during ultrasonic-assisted compression. The results show that under the studied deformation conditions, the yield strength and strain hardening coefficient of Ti2AlNb alloy decrease with the increase of ultrasonic the amplitude. When the amplitude increases to 31 µm. the yield strength decreases by 42%. The ultrasound provides larger dislocation motion energy, increases dislocation activity, and alleviates dislocation stacking, thus reduce the yield strength. The strain hardening exponent and strain rate hardening coefficient increase with the increase of amplitude. The results, obtained from the quantitative analysis of the optimized J–C model, show that the prediction results are in good agreement with the experimental data.
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