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Microstructural evolutions and mechanical properties enhancement of AA 6063 alloy reinforced with Tungsten (W) nanoparticles processed by friction stir processing
Materials Characterization ( IF 4.7 ) Pub Date : 2021-01-13 , DOI: 10.1016/j.matchar.2021.110903
L. Feroz Ali , N. Kuppuswamy , R. Soundararajan , K.R. Ramkumar , S. Sivasankaran

An increase in tensile strength without compromising the ductility is an uphill task in the fabrication of MMCs. This issue can be overwhelmed by the addition of high temperature withstanding metallic nano-particles limiting solubility at elevated temperatures. The present research work concentrates on (a) the development of AA 6063 alloy reinforced with Tungsten nanoparticles (0, 3, 6, 9, and 12 vol%) via FSP, (b) examining the phase analysis using XRD technique, and microstructural evolutions through TEM and EBSD, (c) the improvement in mechanical properties (hardness and tensile strength) and investigate the contribution of strengthening mechanisms, and (d) the work hardening rate, intercept (k) and strain hardening exponents (n) through True stress-strain curves. The results revealed that the uniform dispersion of W nanoparticles is consistent across the stir zone (SZ) of the AA 6063 matrix. Tensile results were witnessed as improvement in UTS with the function of W nanoparticles addition and by elucidating the major loss in ductility. The dispersion strengthening has influenced more to the total strength of the fabricated MMCs due to the pinning effect produced by nano W particles. AA 6063 alloy reinforced with 12 vol% nano W particle specimen has produced superior mechanical properties (Vickers hardness strength of 1.23 GPa, UTS of 432.58 MPa and, elongation of 18.5%.



中文翻译:

钨(W)纳米粒子增强摩擦搅拌加工AA 6063合金的组织演变和力学性能的增强

在不损害延展性的前提下增加抗张强度是制造MMC的艰巨任务。通过添加高温耐受的金属纳米颗粒,可限制该问题在高温下的溶解度。目前的研究工作集中在(a)通过FSP开发用钨纳米颗粒(0、3、6、9和12 vol%)增强的AA 6063合金,(b)使用XRD技术检查相分析以及微观结构演变通过TEM和EBSD,(c)改善机械性能(硬度和拉伸强度)并研究强化机制的贡献,以及(d)通过True应力的加工硬化率,截距(k)和应变硬化指数(n) -应变曲线。结果表明,W纳米颗粒的均匀分散在AA 6063基质的搅拌区(SZ)上是一致的。通过添加W纳米颗粒以及阐明延展性的主要损失,可以看到拉伸结果改善了UTS。由于纳米W粒子产生的钉扎效应,分散增强对制造的MMC的总强度的影响更大。用12%(体积)纳米W颗粒样品增强的AA 6063合金具有优异的机械性能(维氏硬度强度为1.23 GPa,UTS为432.58 MPa,伸长率为18.5%。由于纳米W粒子产生的钉扎效应,分散增强对制造的MMC的总强度的影响更大。用12%(体积)纳米W颗粒样品增强的AA 6063合金具有优异的机械性能(维氏硬度强度为1.23 GPa,UTS为432.58 MPa,伸长率为18.5%。由于纳米W粒子产生的钉扎效应,分散增强对制造的MMC的总强度的影响更大。用12%(体积)纳米W颗粒样品增强的AA 6063合金具有优异的机械性能(维氏硬度强度为1.23 GPa,UTS为432.58 MPa,伸长率为18.5%。

更新日期:2021-01-18
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