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Friction stir processing

About: Friction stir processing is a research topic. Over the lifetime, 2977 publications have been published within this topic receiving 62158 citations.


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TL;DR: In this article, an attempt was made to reinforce stainless steel (SS) particles to prepare AA6082/(0,6,12 and 18vol%) SS AMCs via friction stir processing (FSP).
Abstract: Aluminum matrix composites (AMCs) reinforced with various ceramic particles usually exhibit poor ductility. One solution to increase ductility is the usage of hard metallic or alloy particles as reinforcements. An attempt was made to reinforce stainless steel (SS) particles to prepare AA6082/(0,6,12 and 18 vol%) SS AMCs via friction stir processing (FSP). SS particles were effectively embedded in the aluminum matrix in its alloy form without any detrimental interfacial reaction. The distribution of SS particles in the composite was fairly homogenous. All regions inside the stir zone were filled with SS particles. The composite showed equiaxed fine grains due to dynamic recrystallization and pinning effect. The incorporation of SS particles enhanced the tensile strength of the composites without sacrificing ductility. A network of well developed dimples was observed on the fracture surfaces of the composites ensuring ductility.

62 citations

Journal ArticleDOI
TL;DR: In this paper, a closed-cell porous aluminum was fabricated by friction stir processing (FSP) in a short time with low energy consumption and using inexpensive aluminum plates, achieving a porosity of about 50 pct.
Abstract: Closed-cell porous aluminum was fabricated by friction stir processing (FSP). Porous aluminum with a porosity of about 50 pct was successfully fabricated in a short time with low energy consumption and using inexpensive aluminum plates. Multipass FSP was efficient for fabricating high-porosity and high-quality porous aluminum. The results of the present study show that the FSP technique has high potential for fabricating porous aluminum at a low cost by a more environmentally friendly process.

62 citations

Journal ArticleDOI
TL;DR: In this article, a magnesium alloy AZ31B was friction stir processed by using single and multiple pass FSP and the tensile anisotropy in the friction-stir-processed magnesium alloy was found to originate from the textured microstructure that evolved during FSP.
Abstract: Friction stir processing (FSP) improves the mechanical properties of metallic materials. In this study, a magnesium alloy AZ31B was friction stir processed by using single and multiple pass. The friction-stir-processed magnesium alloy exhibits higher tensile strength and ductility in the transverse direction (TD) compared to the longitudinal direction (LD). Both single pass and multiple (two) pass friction-stir-processed material show similar anisotropy in tensile properties, but the multiple pass friction-stir-processed material shows fine-grained microstructure with higher tensile strength and ductility. The tensile anisotropy in the friction-stir-processed AZ31B originated from the textured microstructure that evolved during FSP.

61 citations

Journal ArticleDOI
TL;DR: The additive friction stir (MELD) process is an emerging solid-state process that enables additive manufacturing of a broad range of metals and metal matrix composites as mentioned in this paper, such as Al-SiC, Al 6061-Mo, and Al 60 61-W composites.
Abstract: MELD, previously known as additive friction stir, is an emerging solid-state process that enables additive manufacturing of a broad range of metals and metal matrix composites. Here, we discuss its potential for fabricating aluminum matrix composites by showing examples of Al-SiC, Al 6061-Mo, and Al 6061-W composites. Thanks to its solid-state nature, MELD is uniquely suited for the use of high-strength aluminum alloys as matrix material, which would suffer from hot cracking problems in liquid-state processes. Using complementary characterization tools, we show that this process results in aluminum matrix composites with no observed porosity and homogeneous particle distribution. These properties stem from the extensive material flow and mixing during the deposition process. In addition to the high quality of produced composites, its ease of use, versatility of feed materials, and scalability all make MELD an attractive tool for additive manufacturing of aluminum matrix composites. We also discuss the limitations of MELD for composite fabrication, with issues related to maximum reinforcement loading, tool wear, and in-plane resolution. Finally, we compare the benefits and limitations of MELD with other composite fabrication processes such as powder bed fusion, friction stir processing, stir casting, and powder processing.

61 citations

Journal ArticleDOI
TL;DR: In this paper, the authors applied friction stir processing to fabricate SiC-Mg bulk composites in order to increase the tensile strength of the composite, which reached 312 MPa.
Abstract: Friction stir processing has been applied to fabricate SiC–Mg bulk composites in this study. AZ63 magnesium alloy, a kind of commercial engineering materials, was selected as base metal. SiC nanoparticles with average size of 40 nm were selected as reinforced particles. After being ultrasonic dispersed in ethanol and friction stir processed with base metal, the SiC particles were uniformly dispersed. Friction stir processing without filling any particles was also applied to base metal as a comparison group. Microstructure evolution was observed by optical microscope and scanning electron microscope. Fine and uniform nugget zone were found both in comparison group and composite. The phases of the material were determined by X-ray diffraction. Transmission electron microscopy observation was conducted to study the condition of SiC nanoparticles. SiC particles were found both inside the grain and at the grain boundary. No micro-sized particle agglomeration was observed in the composite. Vicker hardness and tensile test were carried out to study the mechanical properties of the composite. The average Vicker hardness of the base metal, comparison group and composite were 80 Hv, 85 Hv and 109 Hv respectively. The ultimate tensile strength of the composite reached 312 MPa. Compared with 160 MPa of the as-casted Mg alloy, 263 MPa of the comparison group, the effect of nanoparticles on strength increase was significant.

61 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023236
2022443
2021356
2020322
2019349
2018261