Effect of the addition of Sr modifier in different conditions on microstructure and mechanical properties of T6 treated Al-Mg2Si in-situ composite

Jiang, Wenqiang; Xu, Xiaofeng; Zhao, Yang; Wang, Zhe; Wu, Chao; Pan, Dong; Meng, Zhao-Yuan

doi:10.1016/j.msea.2018.02.100

Cited by 58 publications

(10 citation statements)

References 31 publications

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“…In most of the previous studies, the focus was on modification of the primary Mg 2 Si, which was done by heat treatment [4] or the addition of a nucleant such as Li [4], Na [5,6], Ni [7], P [8,9], Sr [8,10], AlP [11,12] and TiB 2 [12]. However, studies on the modification of eutectic Mg 2 Si have been undertaken through heat treatment [4,10,13] only, which limits the use of these alloys in industry. Therefore, an easy modification method is required for industrial applications.…”

Section: Introductionmentioning

confidence: 99%

Effect of Eutectic Mg2Si Phase Modification on the Mechanical Properties of Al-8Zn-6Si-4Mg-2Cu Cast Alloy

Kim

Jung

Hwang³

et al. 2019

Metals

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The modification effect of Al-5Ti-1B master alloy on eutectic Mg2Si in Al-Zn-Si-Mg system alloy was investigated in this study. The microstructure shows that an extreme effect can be achieved after the addition of Al-5Ti-1B master alloy into the base alloy. The morphology of eutectic Mg2Si changed from Chinese script to fine polygonal shape, and the size was refined from over 50 μm to under 10 μm. This morphology change is believed to be due to TiB2 particles existing in Al-5Ti-1B master alloy, and the presence of TiB2 particles inside the modified Mg2Si was confirmed by scanning electron microscope/energy dispersive spectrometer (SEM/EDS) observation. The mechanical properties were also improved by the addition of Al-5Ti-1B master alloys. This study investigated the reason for the improvement in mechanical properties with the modification of the microstructure.

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Section: Introductionmentioning

confidence: 99%

Effect of Eutectic Mg2Si Phase Modification on the Mechanical Properties of Al-8Zn-6Si-4Mg-2Cu Cast Alloy

Kim

Jung

Hwang³

et al. 2019

Metals

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“…Over the past few years, many researchers have developed various routes to achieve the optimization effect of the Mg 2 Si phase, such as melt superheating [ 11 ], hot extrusion [ 12 , 13 ], ultrasonic melt treatment [ 14 ], rapid solidification [ 15 ], and heat treatment [ 16 , 17 ]. Besides these methods, chemical modifier treatments have been found to be much easier to operate with high efficiency, such as with Na [ 18 ], Sr [ 19 ], Be [ 20 ], Gd [ 21 ], La [ 22 ], and Y [ 23 ]. Farahany et al [ 24 ] reported that a Bi additive also had a significant effect on the morphologies of Al 2 Cu (θ), Al 5 FeSi (β), and Al 5 Cu 2 Mg 8 Si 6 (Q) phases, in addition to an excellent modification effect on primary and eutectic Mg 2 Si in Al–20Mg 2 Si–2Cu composites.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution and Performance Improvement of Hypereutectic Al–Mg2Si Metallic Composite with Ca or Sb

et al. 2020

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In this article, the modification effects on Al–Mg2Si before and after heat treatment were investigated with Ca, Sb, and (Ca + Sb). In comparison with single Ca or Sb, the samples with composition modifiers (Ca + Sb) had the optimal microstructure. The sample with a molar ratio for Ca-to-Sb of 1:1 obtained relatively higher properties, for which the Brinell hardness values before and after heat treatment were remarkably increased by 31.74% and 28.93% in comparison with bare alloy. According to differential scanning calorimetry analysis (DSC), it was found that the nucleation behavior of the primary Mg2Si phase could be significantly improved by using chemical modifiers. Some white particles were found to be embedded in the center of Mg2Si phases, which were deduced to be Ca5Sb3 through X-ray diffraction (XRD) and field-emission scanning electron microscope (FESEM) analyses. Furthermore, Ca5Sb3 articles possess a rather low mismatch degree with Mg2Si particles based on Phase Transformation Crystallography Lab software (PTCLab) calculation, meaning that the efficient nucleation capability of Ca5Sb3 for Mg2Si particles could be estimated.

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“…The tensile properties and machinability of hypereutectic Al-Mg2Si in-situ composite are determined by the morphology and size of Mg2Si particles; therefore, controlling the structure of Mg2Si particles is deemed crucial to achieve the superb mechanical and machinability properties [6][7][8]. In this respect, several approaches such as rapid solidification [9], hot extrusion [10] and superheat treatment [11] and the addition of modifying elements such as Gd [12], Bi [13], Ba [14] and Sb [15] have been applied to control the microstructure of Al-Mg2Si composite.…”

Section: Introductionmentioning

confidence: 99%

Role of Gd addition on machinability of Al-15%Mg2Si in-situ composite during dry turning

Nanda

Ghandvar

Idris

et al. 2020

CST

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Recently, Al-Mg2Si in-situ composites have achieved considerable attention due to their excellent physical and mechanical properties. In fact, there are some limitations of knowledge regarding the machinability characteristics of these composites - particularly when being inoculated with rare earth additions. This study in turn aimed to investigate the influence of machining parameters as well as Gd addition on the machinability of Al-15%Mg2Si composite. To examine the effect of modifier (1.0 wt. % Gd) and machining parameters (feed rate, cutting speed), microstructural evolution, surface roughness (Ra) and cutting force (Fc) were evaluated during dry turning. The results revealed that Gd addition as modifier element led to better surface roughness and higher cutting force owning to the modification of Mg2Si particle structure as well as the formation of Gd intermetallic compounds.

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Effect of the addition of Sr modifier in different conditions on microstructure and mechanical properties of T6 treated Al-Mg2Si in-situ composite

Cited by 58 publications

References 31 publications

Effect of Eutectic Mg2Si Phase Modification on the Mechanical Properties of Al-8Zn-6Si-4Mg-2Cu Cast Alloy

Effect of Eutectic Mg2Si Phase Modification on the Mechanical Properties of Al-8Zn-6Si-4Mg-2Cu Cast Alloy

Microstructure Evolution and Performance Improvement of Hypereutectic Al–Mg2Si Metallic Composite with Ca or Sb

Role of Gd addition on machinability of Al-15%Mg2Si in-situ composite during dry turning

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