Hafnium in Aluminum Alloys: A Review

Jia, Zhihong; Huang, Hua; Wang, Xueli; Yuan, Xing; Qing, Liu

doi:10.1007/s40195-016-0379-0

Cited by 28 publications

(17 citation statements)

References 64 publications

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“…Besides, it has a homogeneous equiaxed dendritic structure and more uniform distribution of the second phases in the interdendritic regions. This is in agreement with some of the literature concluding that even minor Zr addition has considerable effect on the microstructure refinement of aluminium alloys due to presence of Zr-bearing precipitates [2][3][4][5][6][7][8][9][10]. Microstructures of the alloys after homogenization are shown in Figure 1 c and d. After the homogenization of the alloys at 580 °C, interconnected plate-like β-AlFeSi intermetallics may transform to more spheroidal discrete α-AlFeMnSi phase.…”

Section: Experimental Studysupporting

confidence: 90%

“…Alloying elements affect not only the microstructural features but also physical and mechanical properties. Among these alloying elements, Mn is used to control the grain structure resulting in the enhancement of strength [1][2][3][4][5][6]. The wear performance of these alloys can be improved by adding of Si and Cu also has positive effect on the corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

“…The wear performance of these alloys can be improved by adding of Si and Cu also has positive effect on the corrosion resistance. New trends on the enhancement of mechanical properties rely on the addition of Zr, Hf, Sc and V. Several reports revealed that these elements provided a combination of grain refinement and precipitation hardening effects to improve the properties [2][3][4][5]. The addition of Zr leads to form Al 3 Zr precipitates during solidification [7][8].…”

Section: Introductionmentioning

confidence: 99%

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Microstructural and Mechanical Characterization of Al-0.80Mg-0.85Si-0.3Zr Alloy

Kahrıman

Zeren

2017

Archives of Foundry Engineering

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In this study, Al-0.80Mg-0.85Si alloy was modified with the addition of 0.3 wt.-% zirconium and the variation of microstructural features and mechanical properties were investigated. In order to produce the billets, vertical direct chill casting method was used and billets were homogenized at 580 °C for 6 h. Homogenized billets were subjected to aging practice following three stages: (i) solution annealing at 550 °C for 3 h, (ii) quenching in water, (iii) aging at 180 °C between 0 and 20 h. The hardness measurements were performed for the alloys following the aging process. It was observed that peak hardness value of Al-0.80Mg-0.85Si alloy increased with the addition of zirconium. This finding was very useful to obtain aging parameters for the extruded hollow profiles which are commonly used in automotive industry. Standard tensile tests were applied to aged profiles at room temperature and the results showed that modified alloy had higher mechanical properties compared to the non-modified alloy.

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Section: Experimental Studysupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructural and Mechanical Characterization of Al-0.80Mg-0.85Si-0.3Zr Alloy

Kahrıman

Zeren

2017

Archives of Foundry Engineering

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“…In the case of cryogenic rolling plastic, deformation also causes grain refinement, but the additional factor is cryogenic temperature inhibiting grain recovery [13,14]. Another approach allowing to improve properties of aluminum alloys is the modification by alloying elements such as scandium, zirconium or hafnium [16][17][18][19][20][21]. Addition of scandium improves several properties of aluminum alloy by formation of Al 3 Sc phase in its microstructure [17,19].…”

Section: Introductionmentioning

confidence: 99%

Low Cycle Fatigue Properties of Sc-Modified AA2519-T62 Extrusion

et al. 2020

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This investigation presents the results of research on low cycle fatigue properties of Sc-modified AA2519-T62 extrusion. The basic mechanical properties of the investigated alloy have been established in the tensile test. The low cycle fatigue testing has been performed on five different levels of total strain amplitude: 0.4%; 0.5%; 0.6%; 0.7% and 0.8% with cycle asymmetry coefficient R = 0.1. For each level of total strain amplitude, the graphs of variations in stress amplitude and plastic strain amplitude in the number of cycles have been presented. The obtained results allowed to establish Ramberg-Osgood and Manson-Coffin-Basquin relationships. The established values of the cyclic strength coefficient and cyclic strain hardening exponent equal to k’ = 1518.1 MPa and n’ = 0.1702. Based on the Manscon-Coffin-Basquin equation, the values of the following parameters have been established: the fatigue strength coefficient σ’f = 1489.8 MPa, the fatigue strength exponent b = −0.157, the fatigue ductility coefficient ε’f = 0.4931 and the fatigue ductility exponent c = −1.01. The fatigue surfaces of samples tested on 0.4%, 0.6% and 0.8% of total strain amplitude have been subjected to scanning electron microscopy observations. The scanning electron microscopy observations of the fatigue surfaces revealed the presence of cracks in striations in the surrounding area with a high concentration of precipitates. It has been observed that larger Al2Cu precipitates exhibit a higher tendency to fracture than smaller precipitates having a higher concentration of scandium and zirconium.

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“…The addition of Hf into aluminium alloys can form Al 3 Hf equilibrium phases with a D0 23 or D0 22 tetragonal structure depending on the preparation process (Jia et al, 2016), while metastable L1 2 cubic Al 3 Hf precipitates can also form and precipitate continuously (Hori & Furushiro, 1982) or discontinuously (Ryum, 1975) from a supersaturated solid solution of Al-Hf alloys during heat treatment. These kinds of metastable precipitates are most interesting to researchers because of their coherence with the Al matrix, which gives a precipitation strengthening effect and improves the strength of aluminium alloys at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

The orientation relationships of nanobelt-like Si₂Hf precipitates in an Al–Si–Mg–Hf alloy

Wang

Huang

et al. 2016

J Appl Cryst

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The orientation relationships (ORs) between the Al matrix and Si 2 Hf precipitates with an orthorhombic structure in an Al-Si-Mg-Hf alloy after heat treatment at 833 K for 20 h were investigated by transmission electron microscopy and electron diffraction. Four ORs are identified as (100) Al || (010) p , (011) Al || (101) p and [011] Al || [101] p ; (111) Al || (010) p and [011] Al ||[101] p ; (121) Al || (010) p , (101) Al || (100) p and [111] Al || [001] p ; (111) Al || (010) p and [112] Al || [101] p . The habit planes of these four ORs are rationalized by the fraction of good atomic matching sites at the interface. In addition, the formation of Si 2 Hf precipitates with a nanobelt-like morphology is interpreted on the basis of the near-coincident site lattice distribution.

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Hafnium in Aluminum Alloys: A Review

Cited by 28 publications

References 64 publications

Microstructural and Mechanical Characterization of Al-0.80Mg-0.85Si-0.3Zr Alloy

Microstructural and Mechanical Characterization of Al-0.80Mg-0.85Si-0.3Zr Alloy

Low Cycle Fatigue Properties of Sc-Modified AA2519-T62 Extrusion

The orientation relationships of nanobelt-like Si₂Hf precipitates in an Al–Si–Mg–Hf alloy

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Hafnium in Aluminum Alloys: A Review

Cited by 28 publications

References 64 publications

Microstructural and Mechanical Characterization of Al-0.80Mg-0.85Si-0.3Zr Alloy

Microstructural and Mechanical Characterization of Al-0.80Mg-0.85Si-0.3Zr Alloy

Low Cycle Fatigue Properties of Sc-Modified AA2519-T62 Extrusion

The orientation relationships of nanobelt-like Si2Hf precipitates in an Al–Si–Mg–Hf alloy

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The orientation relationships of nanobelt-like Si₂Hf precipitates in an Al–Si–Mg–Hf alloy