Subsurface hardening of Al irradiated with ultrafast infrared laser

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2024-10-09 DOI:10.1016/j.scriptamat.2024.116404

Lucas Rousseau , Djafar Iabbaden , Xxx Sedao , Nathalie Peillon , Szilvia Kalácska , Eleanor Lawrence Bright , Guillaume Kermouche , Jean-Philippe Colombier , András Borbély

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Abstract

The effect of femtosecond laser shock peening on a model Al-0.3Mn alloy was investigated experimentally and numerically by molecular dynamics. Micro-diffraction experiments performed at synchrotron source revealed the depth profiles of the residual stress and the stored energy of dislocations, a measure of local plasticity. The depth of the maximum compressive stress did not coincide with that of the maximum dislocation energy, which was found at the surface. The interaction between the laser and the metal was simulated with LAMMPS using a two-temperature molecular dynamics package. The model accurately described the equation of state of aluminum and showed nearly equal resolved shear stresses on all slip systems at the wavefront. The dislocation density at a depth of 1 μm, predicted by the Meyers' model [1], was higher than the experimental data, suggesting possible recovery due to the increased temperature of the sample after repeated shock loading.

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用超快红外激光照射铝的表层下硬化

我们通过分子动力学实验和数值方法研究了飞秒激光冲击强化对模型 Al-0.3Mn 合金的影响。在同步辐射源上进行的微衍射实验揭示了残余应力和位错储能的深度剖面，这是局部塑性的一种测量方法。最大压应力的深度与位错能量最大值的深度不一致，位错能量最大值出现在表面。激光与金属之间的相互作用是用双温分子动力学软件包 LAMMPS 模拟的。该模型准确地描述了铝的状态方程，并在波前的所有滑移系统上显示出几乎相等的分辨剪应力。梅耶斯模型[1]预测的 1 μm 深度处的位错密度高于实验数据，表明反复冲击加载后样品温度升高可能导致位错恢复。

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来源期刊

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.