Microstructure and Mechanical Properties of Mg-7Al-2Sn Alloy Processed by Super Vacuum Die-Casting

Shi, Xiaoying; Li, Dejiang; Luo, Alan A.; Hu, Bin; Li, Li; Zeng, Xiaoqin; Ding, Wenjiang

doi:10.1007/s11661-013-1799-3

Cited by 29 publications

(6 citation statements)

References 27 publications

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“…1a shows the two-stage super vacuum assisted HPDC process applied for the fabrication of the present die-cast Al-Si-Mg-Mn-TiB2 composites. Different from the generally used one-stage vacuum by evacuation only from the die cavity, here the two-stage vacuum was applied by evacuation from both the shot sleeve and the die cavity simultaneously, and the super vacuum of ~20 mbar was obtained in limited evacuation time, which was far below the commonly achieved vacuum of ~50-100 mbar by the one-stage evacuation process [26][27][28][29]. The details of the two-stage evacuation process were introduced in our latest report [25].…”

Section: Materials Preparationmentioning

confidence: 95%

“…So TiB2 nanoparticles can be chosen to reinforce the die-cast aluminium alloys. Moreover, the super vacuum assisted HPDC process developed recently can achieve a high vacuum of ~20 mbar [25], which is far below the vacuum level of ~50-100 mbar obtained by the conventional vacuum assisted HPDC process [26][27][28][29], and it can largely decrease the gas porosities in HPDC castings and enable the further strengthening of the diecast aluminium alloys through heat treatment.…”

Section: Introductionmentioning

confidence: 92%

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High performance Al/TiB2 composites fabricated by nanoparticle reinforcement and cutting-edge super vacuum assisted die casting process

Dong

Youssef

Zhang

et al. 2019

Composites Part B: Engineering

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The enhancement of double strengthening by nanoparticles and nanoscale precipitates in diecast Al-Si-Mg-Mn-TiB2 composites has be achieved by introducing TiB2 nanoparticles into Al-*Si-*Mg alloy fabricated by super vacuum assisted high pressure die casting process. The composite with 3.5wt.% TiB2 nanoparticles could deliver the hardness of 1.5 GPa, the yield strength of 351 MPa and ultimate tensile strength of 410 MPa in association with an industrially applicable ductility of 5.2 %, after solution and peak ageing heat treatment. The TiB2 nanoparticles distributed at the grain boundaries rather than in the α-Al matrix of the composites in as-cast state. After solution and peak ageing, the TiB2 nanoparticles were enrolled into the α-Al matrix through the combining and coarsening of the α-Al phase during heat treatment, and nanoscale β′′ precipitates formed in the α-Al matrix. Both the TiB2 nanoparticles and the nanoscale β′′ precipitates had highly coherent interfaces with the α-Al matrix, i.e., Al(11-1)//TiB2(0001), Al[011]//TiB2[11-20], Al[320]//β''(a-axis), Al[1-30]//β''(caxis) and Al(020)//β''(b-axis), confirming strong interfacial strengthening. The double strengthening of the TiB2 nanoparticles and the nanoscale β′′ precipitates dispersing in the α-Al matrix resulted in the milestone high strength of the composites.

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Section: Materials Preparationmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 92%

High performance Al/TiB2 composites fabricated by nanoparticle reinforcement and cutting-edge super vacuum assisted die casting process

Dong

Youssef

Zhang

et al. 2019

Composites Part B: Engineering

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“…The more negative the enthalpy of mixing, the more likely the alloys form intermetallic compounds rather than solid solutions. [40][41][42] Su et al [40] pointed out the enthalpy of mixing of Al-Ce was more negative than that of Mg-Ce system, and the enthalpy of mixing of Mg-Al was the least negative, which indicated that Al-Ce phases prefer to be formed in the Mg-Ce-Al ternary alloy in the same condition. The Ce element preferentially reacted with Al to form Al-Ce phases, which consumed some Ce elements and caused the decreasing in the amount of Mg 12 Ce.…”

Section: B Effects Of Solidification Path On Htsmentioning

confidence: 99%

Hot Tearing Behavior in Double Ternary Eutectic Alloy System: Mg-Ce-Al Alloys

Wang

et al. 2020

Metall Mater Trans A

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The hot tearing behaviors of double ternary eutectic alloy system, Mg-4Ce-xAl (x = 0 to 9 wt pct) alloys, were evaluated by a CRC mold. The occurrences of hot tearing were determined by the Volumetric contraction force-Temperature-Time curves combining the solidification paths simulated by Thermo-Calc software. The ratio of drop-in force to final force reflected the severity of hot tearing from the point of micro perspective, its tendency was consistent with the hot tearing susceptibility. Affected by the double ternary eutectic reactions and solidification phases evolution, unlike general alloys, the hot tearing susceptibility curve of Mg-4Ce-xAl alloys contained two peak points. Compared with the hot tearing susceptibility of binary Mg-Al and Mg-Ce alloys, the peak points in Mg-4Ce-xAl alloys were later than that in Mg-Al and Mg-Ce alloys due to the faster diffusion accelerated by the solidification phase of Al 11 Ce 3. The nucleation, propagation and healing of hot tear cracks were affected by the types, fractions, sizes and distributions of solidification phases which mainly included Mg 12 Ce, Al 11 Ce 3 and Mg 17 Al 12 in addition to the matrix Mg.

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“…The magnesium and its alloys have huge potential for the development in the automotive, aircraft, aerospace, medical implant and 3C industries due to low density, good cast-ability, and high specific strength and specific stiffness [1][2][3]. Considering the efficiency and cost of mass production of complex, thin-walled and near-netshape components, the most of the magnesium alloys are produced by high-pressure die casting [4][5][6]. However, compared with wrought magnesium alloy, the casting magnesium alloy and die-casting magnesium alloy have disadvantages such as low strength, poor ductility, and limited processing properties at room temperature.…”

Section: Introductionmentioning

confidence: 99%

The microstructure evolution and mechanical properties improvement of the AZ61 alloy by adding Sc

Zhang

Wang²,

Hai³

et al. 2021

Mater. Res. Express

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The improvement of mechanical properties and the microstructure evolution through adding Sc to AZ61magnesium alloy were studied. The results indicated that the Mg17Al12 phase in the extruded AZ61 alloy was mainly distributed around the sub-structured and fine deformed grains, resulting in the nonuniform microstructure. The addition of Sc could effectively suppress the band-like precipitation of Mg17Al12 phase and improve the uniformity of microstructure. The grain sizes of the extruded alloys showed a trend of first decreasing and then increasing with the increase of Sc, which was mainly attributed to the secondary phase. The AZ61-0.5Sc alloy exhibited the best mechanical properties, its ultimate tensile strength and yield strength were 14.8MPa and 40.8MPa higher than those of the extruded AZ61 alloy, respectively, which was ascribed to the fine grains and abundant secondary phase in the alloy.

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Microstructure and Mechanical Properties of Mg-7Al-2Sn Alloy Processed by Super Vacuum Die-Casting

Cited by 29 publications

References 27 publications

High performance Al/TiB2 composites fabricated by nanoparticle reinforcement and cutting-edge super vacuum assisted die casting process

High performance Al/TiB2 composites fabricated by nanoparticle reinforcement and cutting-edge super vacuum assisted die casting process

Hot Tearing Behavior in Double Ternary Eutectic Alloy System: Mg-Ce-Al Alloys

The microstructure evolution and mechanical properties improvement of the AZ61 alloy by adding Sc

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