Synergistic effect of Sr and La on the microstructure and mechanical properties of A356.2 alloy

Qiu, Chengjun; Miao, Sainan; Li, Xinrong; Xia, Xingchuan; Ding, Jian; Wang, Yongning; Zhao, Weimin

doi:10.1016/j.matdes.2016.10.061

Cited by 68 publications

(33 citation statements)

References 33 publications

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“…However, excessive rare earths result in the precipitation of a large number of rare earth intermetallic compounds (IMCs), which have negative effects on the properties of alloys. Contrary to the results of Alkahtani et al, Qiu et al [16] noted that Sr and La exhibited a better synergistic modification effect. Based on this finding, an Al-6Sr-7La master alloy was successfully developed, and the effect of the master alloy on the microstructure and properties of A356.2 was investigated.…”

Section: Introductionmentioning

confidence: 66%

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Synergistic Effect of Nd and Ga on the Microstructure and Mechanical Properties of ER4047 Alloy Wires

Xue

Tao

et al. 2019

Metals

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The synergistic effects of Nd and Ga on the microstructure and mechanical properties of ER4047 alloy wires and the resulting MIG(Melt inert-gas welding) joints were investigated. Experimental results show that the hydrogen content in the liquid and solid alloy decreases rapidly and then increases slowly with the addition of Nd in the range of 0–0.8 wt.%. Under the same conditions, the hydrogen content ratio in the solid and liquid is between 1.9 and 2.1. After adding 0.08–0.2 wt.% Nd, the α-Al dendrites and eutectic Si phases in the ER4047 alloys are refined and modified, respectively; the quality index of the cast rod increases and the weld percent porosity of the MIG joint significantly decreases. However, when 0.8 wt.% Nd is added, although the size of the eutectic Si phase reaches a minimum value, a large number of coarse needle-like Nd-rich phases precipitate in the structure. Moreover, Ga inhibits the precipitation of the Nd-rich phases, thus improving the mechanical properties, especially the elongation of the cast rod. When 0.2 wt.% Nd and 0.05 wt.% Ga are added into the alloy wire, the porosity of the MIG joint reaches the lowest value herein, and the tensile strength and face/back bending angles reach their maximum values.

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Section: Introductionmentioning

confidence: 66%

“…Therefore, it is necessary to modify the Si phases in Al-Si alloys. The commonly used treatment methods are melt treatment [9], dynamic refinement [10], rapid solidification refinement [11], and alloying [12][13][14][15][16]. Among the existing reports, chemical modifiers are the most widely used.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effect of Nd and Ga on the Microstructure and Mechanical Properties of ER4047 Alloy Wires

Xue

Tao

et al. 2019

Metals

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“…Among them, Sc is the most prominent, and others like Er, La, Ce, Yb, etc. also have a good development potential [8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Effect of Er on Microstructure and Mechanical Properties of 5052 Aluminum Alloy with Big Width-To-Thickness Ratio

et al. 2020

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The effect of Er on microstructure and mechanical properties of the 5052 aluminum alloy with a big width-to-thickness ratio was investigated by a metallurgical microscope, scanning electron microscope and tensile testing machine. The results showed that the precipitates were slightly refined after Er addition and Al3Fe was transformed into Al6Fe and AlEr with/without a small amount of Fe or Si. The effect of Er on grain refinement was related to its content. When Er content was lower or higher than 0.4%, the grain would coarsen. Homogenization could refine the grain by controlling Er content and distribution in the Al matrix. Long time homogenization at high temperature would significantly reduce the strength of the 5052 aluminum alloy and 5052 aluminum alloys with low Er content, but help to improve the plasticity of those with high Er content. The ultimate tensile strength, yield strength and elongation of the as-cast 5052 aluminum alloy were 197 MPa, 117 MPa and 22.5% respectively. The strength was the highest, when Er content was 0.4 wt. % and the elongation was the best at 0.1 wt. % Er content.

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“…Therefore, in the melting and casting process of A356 alloy, refinement and modification are needed. Refining and modification process can not only obtain uniform and fine grains, but also improve the shape together with magnitude of eutectic Si, reduce the segregation of A356 alloy structure, and solve the casting defects for instance stoma, crack together with feather crystal [4].…”

Section: Introductionmentioning

confidence: 99%

“…For example, Liu et al prepared Al-3B-5Sr master alloy by in-situ reaction method [9]. Qiu et al prepared Al-6Sr-7La master alloy with rare earth elements and Sr as refining and modifying elements respectively [10]. These intermediate alloys can not only modify eutectic Si phase, but also refine α-Al of Al-Si alloy.…”

Section: Introductionmentioning

confidence: 99%

Effects of Al-5Ti-0.62C-1.07La intermediate alloy on the microstructure and mechanical properties of A356 aluminum alloy

Ding

Zhang

et al. 2020

Mater. Res. Express

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The physical characters that belong to hypo-eutectic Al-Si alloys are affected by certain important factors including the dimension, distribution together with structure of eutectic Si crystals together with primary α-Al. In this paper, A356-x Al-5Ti-0.62C-1.07La (x=0, 4, 5, 6, 7 wt%) alloys are was prepared by mechanical stirring. The effects of Al-5Ti-0.62C-1.07La intermediate alloy on the microstructures and mechanical properties of A356 alloy are investigated. Results show that the primary α-Al was significantly refined by Al-5Ti-0.62C-1.07La intermediate alloy. The secondary dendrite arm space (SDAS) of unrefined α-Al is approximately 40 μm. When the substance of Al-5Ti-0.62C-1.07La intermediate alloy is 6 wt%, SDAS declines to 10 μm. In addition, the component part of eutectic Si turns from thick acicular/schistose to short rod-like together with a section of pellets. Adding 6 wt% Al-5Ti-0.62C-1.07La intermediate alloy, A356-T6 alloy obtained the best tensile function and hardness. The ultimate tensile strength (UTS), elongation (El) together with Vickers hardness (HV) are 183.5 MPa, 8.2% and 62.3, which is increased by 30.3%, 95.2% and 38.1%, respectively. Furthermore, the variation in mechanical properties change with the development of micro-structure.

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Synergistic effect of Sr and La on the microstructure and mechanical properties of A356.2 alloy

Cited by 68 publications

References 33 publications

Synergistic Effect of Nd and Ga on the Microstructure and Mechanical Properties of ER4047 Alloy Wires

Synergistic Effect of Nd and Ga on the Microstructure and Mechanical Properties of ER4047 Alloy Wires

Effect of Er on Microstructure and Mechanical Properties of 5052 Aluminum Alloy with Big Width-To-Thickness Ratio

Effects of Al-5Ti-0.62C-1.07La intermediate alloy on the microstructure and mechanical properties of A356 aluminum alloy

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