激光冲击强化提高多晶α相钛合金阻尼性能的研究

IF 5 2区 物理与天体物理 Q1 OPTICS
Jing Li , Weining Lu , Lin Liu , Youjun Ye , Haijun Pan , Yujie Zhao , Aixin Feng
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引用次数: 0

摘要

通过分子动力学模拟研究了激光冲击强化(LSP)对多晶α相钛合金阻尼能力的影响。采用活塞法模拟了冲击速度为 0.7 km/s、1.0 km/s 和 1.3 km/s 的 LSP 过程。结果表明,LSP 可提高阻尼能力,且随着冲击速度的增加,强化效果也随之增加。与原始模型相比,冲击速度为 1.3 km/s 的 LSP 模型在应变振幅为 3 %、5 % 和 7 % 时的比阻尼能力分别提高了 109.07 %、85.54 % 和 52.93 %。LSP 使更大面积的晶界协调塑性变形,有利于消散振动能量。孪晶边界的可逆运动以及六方紧密堆积相和面心立方相之间的相对滑移将振动能转化为热能耗散。此外,孪晶边界位错的运动和积累最终导致了振动能的消耗。因此,LSP 诱导的微结构的综合效应极大地增强了多晶 α 相钛合金的阻尼能力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Research on improving damping capacity of polycrystalline α-phase titanium alloy processed by laser shock peening
The effects of laser shock peening (LSP) on the damping capacity of polycrystalline α-phase titanium alloy were investigated through molecular dynamics simulation. The piston method was used to simulate the LSP process with the shock velocity of 0.7 km/s, 1.0 km/s and 1.3 km/s. The results indicated that LSP could improve the damping capacity, and the strengthening effect increases with increasing the shock velocity. Compared with original model, the specific damping capacity of the LSPed model with shock velocity of 1.3 km/s was improved by109.07 %, 85.54 % and 52.93 % at strain amplitudes of 3 %, 5 % and 7 %, respectively. LSP enabled more area of grain boundaries to coordinate plastic deformation, which was beneficial for dissipating vibration energy. The reversible motion of twin boundaries and the relative slip between hexagonal close-packed and face centered cubic phases converted vibration energy into thermal energy dissipation. Additionally, the motion and accumulation of dislocations at twin boundaries ultimately led to the consumption of vibration energy. Thus, the comprehensive effect of LSP-induced microstructures significantly contributed to enhancing the damping capacity of polycrystalline α-phase titanium alloy.
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来源期刊
CiteScore
8.50
自引率
10.00%
发文量
1060
审稿时长
3.4 months
期刊介绍: Optics & Laser Technology aims to provide a vehicle for the publication of a broad range of high quality research and review papers in those fields of scientific and engineering research appertaining to the development and application of the technology of optics and lasers. Papers describing original work in these areas are submitted to rigorous refereeing prior to acceptance for publication. The scope of Optics & Laser Technology encompasses, but is not restricted to, the following areas: •development in all types of lasers •developments in optoelectronic devices and photonics •developments in new photonics and optical concepts •developments in conventional optics, optical instruments and components •techniques of optical metrology, including interferometry and optical fibre sensors •LIDAR and other non-contact optical measurement techniques, including optical methods in heat and fluid flow •applications of lasers to materials processing, optical NDT display (including holography) and optical communication •research and development in the field of laser safety including studies of hazards resulting from the applications of lasers (laser safety, hazards of laser fume) •developments in optical computing and optical information processing •developments in new optical materials •developments in new optical characterization methods and techniques •developments in quantum optics •developments in light assisted micro and nanofabrication methods and techniques •developments in nanophotonics and biophotonics •developments in imaging processing and systems
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