Effect of abrasive size on nano abrasive machining for wurtzite GaN single crystal via molecular dynamics study

Effect of abrasive size on nano abrasive machining for wurtzite GaN single crystal via molecular dynamics study
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通过分子动力学研究磨料尺寸对纤锌矿GaN单晶纳米磨料加工的影响

DOI:
10.1016/j.mssp.2020.105439
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发表时间:
2021
影响因子:
4.1
通讯作者:
Guo Jian
Guo Jian
中科院分区:
工程技术3区
文献类型:
--
作者:
Wang Yongqiang;Guo Jian

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采用分子动力学模拟方法研究了磨料尺寸对纤锌矿氮化镓(GaN)单晶纳米磨料加工的影响。系统地分析了磨料尺寸对变形行为的影响。模拟结果表明,增加磨料尺寸导致更严重的塑性变形和加工诱导硬化,从而导致原子温度,应变,应力和切削力的增加。较大磨料的使用产生较大的压缩,从而提高了GaN单晶的弹性恢复,并对亚表面造成了更严重的损伤,位错的形核和发射增强,并发生了由B4结构到B3结构甚至五重六方结构的局部相变。堆积和非晶化的发展是令人印象深刻的抑制通过增加磨料尺寸,这表明,切削效果可能会受损,在给定的切削深度下使用较大的磨料。
Molecular dynamics simulations were used to explore the effect of abrasive size on the nano abrasive machining for wurtzite gallium nitride (GaN) single crystal. The deformation behaviours, varied with the abrasive size, were systematically analysed. The simulation results show that increasing the abrasive size results in more severe plastic deformation and machining-induced hardening, which consequently cause an increase in atomic temperature, strain, stress, and cutting forces. The use of larger abrasive produces greater compression, thus boosts the elastic recovery and damages the subsurface of GaN single crystal much heavily, with the enhancement of the nucleation and emission of dislocation, and the local phase transition from B4 to B3 structure or even to fivefold hexagonal structure. The development of pile-up and amorphization is impressively inhibited by increasing abrasive size, suggesting that the cutting effect could be impaired using a larger abrasive under a given depth of cut.
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