Investigation on diffusion bonding characteristics of SiC particulate reinforced aluminium metal matrix composites (Al/SiCp-MMC)

“…On the other hand, SSM356 aluminum alloy represents particle incorporation of Mg2Si phase; the temperature during diffusion influences repeated precipitation of MgZn2 and Mg2Si phase. Thus, only the recrystallization of the parent microstructure can be considered as a microstructural transformation caused by the thermal cycles [15]. Likewise, high temperature causes the movement of the particles from two materials resulting atomic diffusion because it can increase the diffusion rate.…”

Section: Default Fontsmentioning

confidence: 99%

Evaluation of Microstructure and Mechanical Properties in Dissimilar Joint of SSM7075 with SSM356 Aluminum Alloy using Diffusion Bonding

Dunyakul

Meengam

Maunkhaw

et al. 2016

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Abstract. The aim of this study is to investigate joining parameters that affect microstructure and mechanical properties of diffusion bonding technique in dissimilar joints between SSM7075 and SSM356 aluminum alloys. Diffusion bonding methods were investigated by joining parameters as follows: contact pressure at 3 MPa, holding time 60 and 120 minutes and temperature at 673, 723, 773 and 823 K respectively, under argon atmosphere at 4 liters per minute. After experiments, the results of the investigation have shown that a condition used contact pressure at 3 MPa, holding time 120 minutes, and temperature at 773 K is complete and no defects and voids. Examination of the joint region using SEM and EDX showed that the microstructure in weld zone after welding is globular structure, and eutectics phases of two materials diffuse together. In weld zone, it was found that formation of eutectic phases has Al2CuMg, Mg2Si and Al2Mg2Zn3 phases along the bond interface, distributed throughout bond interface. The tensile tested showed the maximum tensile strength of 94.94 MPa. The hardness was tested for optimum hardness value, 121.20 HV. However, the heat during welding, resulting in precipitation within the aluminum matrix (α-Al), led to increased hardness after diffusion bonding.

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“…X.-P. Zhang et al [45] reported that good joints of an Al-SiC MMCs were successfully produced by vacuum diffusion bonding. A soft active layer of Al-Si-Mg and a pure copper foil were actually used as interlayer in their study.…”

Section: Diffusion Bondingmentioning

confidence: 99%

Joining of Al-B4C metal matrix composites by laser welding and friction stir welding /

Guo¹

2012

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AI-B4C MMCs are important materials as neutron absorber in spent nuclear fuel storage and transportation due to their high boron ( 10 B) concentration and thus high neutron absorption capability. However, wide application of these materials is still limited due to the lack of suitable joining techniques to fully take advantage of the materials. Problems such as porosity and chemical reaction between Al matrix and B4C particles can arise during fusion welding of the material. Therefore, the present study is intended to find effective and reliable welding techniques for AI-B4C MMCs. The weldability of AA1100-16%B 4 C (particle size: 11 pirn) and AA1100-30%B 4 C MMCs (median particle size: 15 pirn) was evaluated using laser welding and friction stir welding. In comparison with conventional arc welding techniques, the deep and narrow fusion zones associated with laser welding can result in smaller heat affected zones, and thus less thermal distortion and mechanical property degradation. On the other hand, friction stir welding, as a solid state process, seems promising as it can avoid various problems that may otherwise be encountered during fusion welding of MMCs.For laser welding without filler, it was found that most B4C particles were decomposed during welding leading to formation of needle-like AIB2 and AI3BC phases in the weld. In this case, a joint efficiency of 63% (UTS) after tensile test was obtained. The variation of laser power from 2 to 4 kW and welding speed from 1 to 2.5 m/min did not affect the needle-like morphology. Based on thermodynamic calculation, Ti filler was used as the filler material aiming to improve the properties of laser joints. It was found that the addition of Ti with 150 |nm thick foil increased the joint efficiency to 75% due to the decrease of size and quantities of needle-like phases. The addition of Ti with filler wire instead of Ti foil did not show significant mechanical property improvement due to the Ti segregation and microstructure inhomogeneity in the weld zone.On the other hand, the feasibility of friction stir welding for joining AA1100 based metal matrix composites reinforced with B 4 C particulate was studied for 16 and 30%B 4 C volume concentrations. For both composites, friction stir welding has a significant influence on the particle size distribution and the matrix grain size. For the AA1100-16%B4C composite, the average particle size decreases after welding by -20% and the grain size from 15 to 5 [xm as measured in the weld nugget. Tensile testing of welded joints showed up to 100% joint efficiency for both annealed AA1100-16%B 4 C and AA1100-30%B4C composite materials. However, if the ultimate tensile strength values of all the studied composites are similar at -130 MPa, the weld ductility is higher for the annealed materials. In addition, it was observed that varying the welding speed between 100 and 275 mm/min does not influence the joint tensile properties and the particle size distribution in the nugget. Furthermore, a welding tool made of WC-Co show...

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Investigation on diffusion bonding characteristics of SiC particulate reinforced aluminium metal matrix composites (Al/SiCp-MMC)

Cited by 94 publications

References 12 publications

Mechanical Behavior of AL 7075 Reinforced with Al2O3 and SIC Nano Particles Fabricated by STIR Casting Method

Mechanical Behavior of AL 7075 Reinforced with Al2O3 and SIC Nano Particles Fabricated by STIR Casting Method

Evaluation of Microstructure and Mechanical Properties in Dissimilar Joint of SSM7075 with SSM356 Aluminum Alloy using Diffusion Bonding

Joining of Al-B4C metal matrix composites by laser welding and friction stir welding /

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