Improved mechanical properties in vacuum-assist high-pressure die casting of AZ91D alloy

Li, X.; Xiong, Shengwu; Zhang, Guo

doi:10.1016/j.jmatprotec.2015.12.005

Cited by 53 publications

(9 citation statements)

References 25 publications

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“…The test specimens were cast by horizontal cold chamber die casting machine OMS 450. The machine was equipped with a vacuum system consisting of a vacuum pump, vacuum tank and vacuum valves, in order to evacuate the air and other gases [7], which are trapped in the die cavity and in the shot sleeve system [8]. The lowest pressure level, that can be achieved by the current vacuum system is theoretically 50 mbar.…”

Section: Die Casting Materialsmentioning

confidence: 99%

“…The Weibull plot [8] is another way of presenting a cumulative distribution (CD) of data. The shapes of the Weibull plots are a measure of the reproducibility of the data.…”

Section: Mechanical Property Analysismentioning

confidence: 99%

“…An additional challenge is the fact that porosity in a casting may not be immediately detected after die cast, but only revealed during subsequent processing such as welding or heat treatment. One possible solution to reduce the amount of gas in the die cavity is vacuum assistance [8]. Vacuum-assisted die casting (VPDC) were introduced into cold chamber die casting process in this present work.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Vacuum on the Mechanical Properties of Die Cast Aluminum AlSi9Cu3(Fe) Alloy

Szalva

Orbulov

2019

Inter Metalcast

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High pressure die casting (HPDC) is a widely used casting technology for product that is made of light metal such as aluminum alloy. During die casting process the molten metal is injected into a mold at high speed and solidify under high pressure. The amount of porosity in the cast part is an important question. Lots of technologies have been developed to minimize porosities, for example, vacuum-assisted high pressure die casting process (VPDC). In this paper, AlSi9Cu3(Fe) aluminum alloy castings were produced by conventional HPDC with atmospheric venting and VPDC process under three different absolute cavity air pressures of 170 mbar, 90 mbar and 70 mbar at the cavity. The influence of absolute cavity air pressure on the porosity and on the mechanical properties of the castings were investigated and compared with conventional HPDC casting method. The results of the present study proved that the amount of porosity and the pore sizes in the castings can be significantly reduced from 1.10% at an atmospheric level to 0.47% at 70 mbar. This corresponds to 57% reduction. As a result, the mechanical properties are improved significantly, particularly, the tensile strength from 271.6 MPa to 299.8 MPa, which corresponds to 10% increment and the elongation from 1.66% to 2.49%, which shows 50% increment. At lower absolute cavity air pressure the entrapped gases become the final gas porosities in the die castings and shows solidification shrinkage form inspected with scanning electron microscopy. In general, lower cavity air pressure contributes to reduce the pores, which improve the mechanical properties of die casting.

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Section: Die Casting Materialsmentioning

confidence: 99%

“…The Weibull plot [8] is another way of presenting a cumulative distribution (CD) of data. The shapes of the Weibull plots are a measure of the reproducibility of the data.…”

Section: Mechanical Property Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Effect of Vacuum on the Mechanical Properties of Die Cast Aluminum AlSi9Cu3(Fe) Alloy

Szalva

Orbulov

2019

Inter Metalcast

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“…In HPDC process, high vacuum technology can significantly reduce porosities by avoiding gas entrapment [14,15] and increase the casting integrity. Moreover, the mechanical properties of the castings can be further improved by heat-treatment.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of High Vacuum Die-Cast AlSiMgMn Alloys at as-Cast and T6-Treated Conditions

et al. 2019

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Al–Si–Mg based alloys can provide high strength and ductility to satisfy the increasing demands of thin wall castings for automotive applications. This study has investigated the effects of T6 heat-treatment on the microstructures, the local mechanical properties of alloy phases and the fracture behavior of high vacuum die-cast AlSiMgMn alloys using in-situ scanning electron microscopy (SEM) in combination with nano-indentation testing. The microstructures of the alloys at as-cast and T6 treated conditions were compared and analyzed. It is found that the T6 heat treatment plays different roles in affecting the hardness and the Young’s modulus of alloy phases. This study also found that the T6 heat treatment would influence the failure modes of the alloys. The mechanisms of crack propagation in the as-cast and T6 treated alloys were also analyzed and discussed.

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“…Mg-9Al-1Zn (AZ91D) components produced by high pressure die casting (HPDC) became more attractive in automotive field to achieve the light weighting of vehicles due to the reasonable comprehensive mechanical properties of alloy and its good castability [1,2]. Besides the advantage of HPDC of high speed production, small thickness, good surface finish and closer dimensional tolerance [3], the main defects of this technology are the formation of porosity and defect band and then result in the deterioration of mechanical properties and the enlargement of the properties variation [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Variation improvement of mechanical properties of Mg-9Al-1Zn alloy with melt conditioned high pressure die casting

Zhang

Patel

Wang

et al. 2018

Materials Characterization

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Melt conditioning treatment via high shearing on Mg-9Al-1Zn melt was employed to disperse the oxide inclusions, and to harness the well-dispersed particles as the effective heterogeneous nucleation sites for primary α-Mg grains during solidification in high pressure die casting. To reveal the mechanism of property improvement, Prefil pressure filtration cleanliness analyser, field-emission scanning electron microscopy with energy dispersive X-ray spectroscopy and high-resolution transmission electron microscopy were employed in present study. The experimental results showed that the application of high shearing not only improved elongation, ultimate tensile strength and yield strength simultaneously, but also reduced the variation of the mechanical properties of Mg-9Al-1Zn alloy. The improvement was ascribed to the refinement of the primary α-Mg grains formed in both shot sleeve and die cavity, and to the reduction of porosity as well as refinement of Mg17Al12 phases.

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Improved mechanical properties in vacuum-assist high-pressure die casting of AZ91D alloy

Cited by 53 publications

References 25 publications

The Effect of Vacuum on the Mechanical Properties of Die Cast Aluminum AlSi9Cu3(Fe) Alloy

The Effect of Vacuum on the Mechanical Properties of Die Cast Aluminum AlSi9Cu3(Fe) Alloy

Microstructure and Mechanical Properties of High Vacuum Die-Cast AlSiMgMn Alloys at as-Cast and T6-Treated Conditions

Variation improvement of mechanical properties of Mg-9Al-1Zn alloy with melt conditioned high pressure die casting

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