Microstructural modification of as-cast Al-Si-Mg alloy by friction stir processing

Y., Z.; Sharma, Sanjay; Mishra, Rajiv S.

doi:10.1007/bf02586167

Cited by 193 publications

(140 citation statements)

References 39 publications

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“…For example, the duration the temperature remains above 200°C during FSP of A356 aluminum alloy is only 25 seconds. [30] Therefore, the dissolution of the eutectic b-Mg 17 Al 12 phase in such a short period is associated with severe plastic deformation, with a strain rate of 10 0 to 10 2 s -1 and strains of up to~40. [3,31,32] A previous analysis has indicated that such a severe plastic deformation facilitates the dissolution of the b-Mg 17 Al 12 phase significantly, due to significantly accelerated diffusion rate and shortened diffusion distance.…”

Section: A Microstructural Characteristicsmentioning

confidence: 99%

Effect of Friction Stir Processing Procedures on Microstructure and Mechanical Properties of Mg-Al-Zn Casting

Feng

Xiao²,

Y.³

et al. 2009

Metall Mater Trans A

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Cast Mg-Al-Zn (AZ80) alloy was subjected to friction stir processing (FSP) with three different FSP procedures: single pass, single pass with a pre-solution treatment (pre-ST), and two pass. FSP resulted in remarkable grain refinement, significant breakup, and dissolution of the coarse, networklike Mg 17 Al 12 phase. While the single-pass FSP procedure produced a heterogeneous microstructure with Mg 17 Al 12 particle-rich bands, both the pre-ST FSP and the two-pass FSP procedures resulted in the generation of a uniform microstructure. The pre-ST FSP and twopass FSP samples exhibited significantly enhanced strength and ductility due to remarkable grain refinement and dissolution of coarse Mg 17 Al 12 phase. A post-FSP aging resulted in the precipitation of fine Mg 17 Al 12 particle, thereby increasing the strength of the FSP samples. Among three FSP samples, the aged two-pass FSP sample exhibited the highest ultimate tensile strength (UTS) of 356 MPa and an elongation of 17 pct.

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Section: A Microstructural Characteristicsmentioning

confidence: 99%

Effect of Friction Stir Processing Procedures on Microstructure and Mechanical Properties of Mg-Al-Zn Casting

Feng

Xiao²,

Y.³

et al. 2009

Metall Mater Trans A

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“…However, raising the tool rotation speed above 1000 rpm does not cause further significant refinement of the silicon particle, which means, the mean area size of the silicon particles increases with increased heat input [9]. This is related with the enhanced flow-ability of the matrix as a result of high localized heat input conditions at higher tool rotational speeds, that soften the material around the tool pin and caused the Si particles flow with the plastic flow of the matrix [2,8], and therefore the breakdown of the silicon particles would not intensified further [2]. In this study tool rotation speed of 1000 rpm gives the minimum mean area size and aspect ratio of 47.8 µm², 1.69 respectively.…”

Section: Methodsmentioning

confidence: 99%

“…In order to solve these problems, a practical technique of microstructure modification which can effectively reduce the porosity and uniformly redistribute the fine Si particles in the aluminum matrix is imperative. Recently, friction stir processing (FSP), a variant of friction stir welding (FSW), in which the intense plastic deformation generated by traversing a welding tool [6] has been used as a technique to locally modify the microstructure in a number of Al-Si cast alloys [7][8][9]. In FSP a rotating tool with a designed pin and shoulder is plunged into a monolithic workpiece and produces a recrystallized fine particles microstructure within the stirred zone (SZ).…”

Section: Introductionmentioning

confidence: 99%

Microstructure and wear behavior of friction stir processed cast hypereutectic aluminum silicon

et al. 2017

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Abstract. Hypereutectic as-cast Al-18Si-Cu-Ni alloy was subjected to friction stir processing (FSP). The resultant effect of FSP on the alloy was evaluated by microstructure analysis and wear tests (dry sliding). A significant microstructural modification and enhancement in wear behavior of Al-18Si-Cu-Ni alloy was recorded after friction stir processing. Wear resistance improvement was related to considerable modification in size, morphology and distribution of silicon particles, and hardness improvement. It was found that lower tool rotation speed was more effective to refine silicon particles and in turn increase wear resistance. Minimum Si particle mean area of about 47.8 µm², and wear rate of 0.0155 mg/m was achieved.

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“…These modification and heat-treatment techniques mentioned previously, unfortunately, cannot effectively eliminate the porosity in Al-Si, and redistribute the Si particles uniformly into the aluminum matrix. Therefore, a more effective modification technique is highly desirable for microstructural modification of cast aluminium alloy, such as Friction Stir Processing which was developed basing on friction stir welding (FSW) [1].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study and Response Surface Methodology for Investigation of FSP Process

Węglowski¹

2014

Archive of Mechanical Engineering

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The article presents the effect of rotational and travelling speed and down force on the spindle torque acting on the tool in Friction Stir Processing (FSP) process. The response surface methodology (RSM) was applied to find a dependence combining the spindle torque acting on the tool with the rotational speed, travelling speed and the down force. The linear and quadratic models with interaction between parameters were used. A better fitting was achieved for a quadratic model. The studies have shown that the increase in rotational speed causes a decrease in the torque while the increase in travelling speed and down force causes an increase in the torque. The tests were conducted on casting aluminium alloy AlSi9Mg. Metallography examination has revealed that the application of FSP process results in a decrease in the porosity in the modified material and microstructure refining in the stir zone. The segregation of Si and Fe elements was evident in the parent material, while in the friction stir processed area this distribution was significantly uniform.

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Microstructural modification of as-cast Al-Si-Mg alloy by friction stir processing

Cited by 193 publications

References 39 publications

Effect of Friction Stir Processing Procedures on Microstructure and Mechanical Properties of Mg-Al-Zn Casting

Effect of Friction Stir Processing Procedures on Microstructure and Mechanical Properties of Mg-Al-Zn Casting

Microstructure and wear behavior of friction stir processed cast hypereutectic aluminum silicon

Experimental Study and Response Surface Methodology for Investigation of FSP Process

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