Microstructure and mechanical properties of rheo-diecast (RDC) aluminium alloys

Fan, Z.; Fang, Xiaolong; Ji, Shouxun

doi:10.1016/j.msea.2005.09.001

Cited by 120 publications

(69 citation statements)

References 10 publications

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“…The purpose of the low filling velocity is to effectively avoid air entrapment. The second is the inherent characteristic of the semisolid forming [2,5,17]. The spherical morphology of the primary α-Mg grains would be more favorable to liquid penetration for feeding [28].…”

Section: Porosity Evaluationmentioning

confidence: 99%

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A Comparative Characterization of the Microstructures and Tensile Properties of As-Cast and Thixoforged in situ AM60B-10 vol% Mg2Sip Composite and Thixoforged AM60B

Zhang

Chen

Cheng

et al. 2015

Metals

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Abstract:The microstructure and tensile properties of the thixoforged in situ Mg2Sip/AM60B composite were characterized in comparison with the as-cast composite and thixoforged AM60B. The results indicate that the morphology of α-Mg phases, the distribution and amount of β phases and the distribution and morphology of Mg2Si particles in thixoforged composite are completely different from those in as-cast composite. The Mg2Si particles block heat transfer and prevent the α-Mg particles from rotation or migration during reheating. Both the thixoforged composite and thixoforged AM60B alloy exhibit virtually no porosity in the microstructure. The thixoforged composite has the highest comprehensive tensile properties (ultimate tensile strength (UTS)) of 209 MPa and an elongation of 10.2%. The strengthening mechanism of the Mg2Si particle is the additive or synergetic effect of combining the load transfer mechanism, the Orowan looping mechanism and the dislocation strengthening mechanism. Among them, the load transfer mechanism is the main mechanism, and the latter two are minor. The particle splitting and interfacial debonding are the main damage patterns of the composite.

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Section: Porosity Evaluationmentioning

confidence: 99%

“…As a novel metal process manufacturing, thixoforging involves the advantages of both casting and forging technologies and significantly decreases or even eliminates porosities [2,17]. Consequently, superior tensile properties of the thixoforged components resulting from the pore-free fine microstructure can be achieved.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Characterization of the Microstructures and Tensile Properties of As-Cast and Thixoforged in situ AM60B-10 vol% Mg2Sip Composite and Thixoforged AM60B

Zhang

Chen

Cheng

et al. 2015

Metals

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“…Moreover, the solidification shrinkage is smaller than for the liquid phase; therefore, the dimensional accuracy is improved and shrinkage porosity are decreased. The semi-solid process has been examined for aluminum 1,2) and magnesium alloys 3,4) because of these advantages. A problem is that the semi-solid forming process has lower formability than HPDC because the fluidity of the semi-solid metal is lower than the liquid phase.…”

Section: Introductionmentioning

confidence: 99%

Fluidity Evaluation of the AC4CH (A356) Aluminum Alloy Semi-Solid Slurry Made by Mechanical Vibration Method

Murakami

Miwa

Kito³

et al. 2016

Mater. Trans.

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The semi-solid process is promising as a near-net-shape method for producing high performance products. However, the method is hampered by poor formability because of low fluidity, and difficulty in making the semi-solid slurry. In previous work, we made semi-solid slurries containing small, spherical solid particles by applying mechanical vibration. In this study, we evaluated the fluidity of AC4CH aluminum alloy slurries made by applying mechanical vibration. In addition, we improved the slurry fluidity by applying shear stress to the slurry at the mold gate, and investigated the effect of the shear rate on the fluidity. The slurry was prepared by applying mechanical vibration at a frequency of 50 Hz and an acceleration amplitude of 166.6 m/s 2 (17 G). The fluidity was evaluated by injecting the slurry through a gate into a metallic mold with a spiral cavity, and measuring the fluidity length. The shear rate at the gate was controlled by changing the thickness of the gate (1.0, 2.2, and 4.0 mm). The fluidity of the slurry made by mechanical vibration was 25% to 40% that of liquid aluminum. Applying shear stress at the gate increased the fluidity by approximately 30%. The ¡-phase particles in the specimen became finer and rounder as the shear rate increased. Therfore, semi-solid slurry with high fluidity can be obtained by applying mechanical vibration and increasing the shear rate. Moreover, the slurry prepared by mechanical vibration had similar fluidity to the electromagnetically stirred slurry prepared at high shear rates and casting pressures. Our method could be used to to fabricate complex products by the semi-solid forming process.

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“…The density of aluminum (2.7 g/cm 3 ) is one-third that of iron (7.9 g/cm 3 ) and, as its mechanical properties and workability are excellent, aluminum is used for casting and forging. Even with these advantages, because an aluminum alloy has substantially inferior mechanical properties compared with those of a ferrous alloy, alloy composition and process methods should be improved for better mechanical properties [1][2][3][4][5][6]. Aluminum process methods are classified into casting, forging, and plastic deformation.…”

Section: Introductionmentioning

confidence: 99%

Vacuum Die Casting Process and Simulation for Manufacturing 0.8 mm-Thick Aluminum Plate with Four Maze Shapes

Jin

Jang

Kang

2015

Metals

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Using vacuum die casting, 0.8 mm-thick plates in complicated shapes are manufactured with the highly castable aluminum alloy Silafont-36 (AlSi9MgMn). The sizes and shapes of the cavities, made of thin plates, feature four different mazes. To investigate formability and mechanical properties by shot condition, a total of six parameters (melt temperatures of 730 °C and 710 °C; plunger speeds of 3.0 m/s and 2.5 m/s; vacuum pressure of 250 mbar and no vacuum) are varied in experiments, and corresponding simulations are performed. Simulation results obtained through MAGMA software show similar tendencies to those of the experiments. When the melt pouring temperature is set to 730 °C rather than 710 °C, formability and mechanical properties are superior, and when the plunger speed is set to 3.0 m/s rather than to 2.5 m/s, a fine, even structure is obtained with better mechanical properties. The non-vacuumed sample is half unfilled. The tensile strength and elongation of the sample fabricated under a melt temperature of 730 °C, plunger speed of 3.0 m/s, and vacuum pressure of 250 mbar are 265 MPa and 8.5%, respectively.

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Microstructure and mechanical properties of rheo-diecast (RDC) aluminium alloys

Cited by 120 publications

References 10 publications

A Comparative Characterization of the Microstructures and Tensile Properties of As-Cast and Thixoforged in situ AM60B-10 vol% Mg2Sip Composite and Thixoforged AM60B

A Comparative Characterization of the Microstructures and Tensile Properties of As-Cast and Thixoforged in situ AM60B-10 vol% Mg2Sip Composite and Thixoforged AM60B

Fluidity Evaluation of the AC4CH (A356) Aluminum Alloy Semi-Solid Slurry Made by Mechanical Vibration Method

Vacuum Die Casting Process and Simulation for Manufacturing 0.8 mm-Thick Aluminum Plate with Four Maze Shapes

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