Improvements engineered in UTS and elongation of aluminum alloy high pressure die castings through the alteration of runner geometry and plunger velocity

Abstract Recent research in the process of aluminum alloy die castings production, which is nowadays deeply implemented into the rapidly growing automobile, shipping and aircraft industries, is aimed at increasing the useful qualitative properties of the die casting in order to obtain its high mechanical properties at acceptable economic cost. Problem of technological factors of high pressure die casting has been a subject of worldwide research (EU, US, Japan, etc.). The final performance properties of die castings are subjected to a large number of technological factors. The main technological factors of high pressure die casting are as follows: plunger pressing speed, specific (increase) pressure, mold temperature as well as alloy temperature. The contribution discusses the impact of the plunger pressing speed and specific (increase) pressure on the mechanical properties of the casting aluminum alloy.

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Estimation of Die Release Force of mboxJIS-ADC12 Aluminum Alloy Die Castings Manufactured Through High-Pressure Die Casting via Computer Simulation

International Journal of Automation Technology ◽

10.20965/ijat.2018.p0955 ◽

2018 ◽

Vol 12 (6) ◽

pp. 955-963

Author(s):

Makoto Nikawa ◽

Kengo Usui ◽

Hiroaki Iwahori ◽

Atsushi Sato ◽

Minoru Yamashita ◽

...

Keyword(s):

High Pressure ◽

Aluminum Alloy ◽

Friction Coefficient ◽

Die Casting ◽

Coupled Analysis ◽

Fe Model ◽

High Pressure Die Casting ◽

Die Castings ◽

Pressure Die Casting ◽

Release Force

A method for the estimation of the die release force of die castings of JIS-ADC12 aluminum alloy manufactured through high-pressure die casting was examined. The die release force was evaluated by the strain in the axial direction of the extrusion pin when releasing the die castings. In this research, it was assumed that the factors that influenced the die release force were the thermal deformation of the die and die castings and the reaction layer of Al and Fe generated during the solidification process in the die. These factors in the resistance of the die release were evaluated by the friction coefficient. The die and die castings temperature in the die release process were simulated, and calculation results were mapped onto an FE model, and a coupled analysis of the thermal structure was performed. The calculated value of the mold release force was approximately the same as the actual value, and the friction coefficient was estimated to be approximately 0.5.

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Hydrogen trapped at intermetallic particles in aluminum alloy 6061-T6 exposed to high-pressure hydrogen gas and the reason for high resistance against hydrogen embrittlement

International Journal of Hydrogen Energy ◽

10.1016/j.ijhydene.2017.08.035 ◽

2017 ◽

Vol 42 (38) ◽

pp. 24560-24568 ◽

Cited By ~ 10

Author(s):

Junichiro Yamabe ◽

Tohru Awane ◽

Yukitaka Murakami

Keyword(s):

High Pressure ◽

Aluminum Alloy ◽

Hydrogen Embrittlement ◽

High Resistance ◽

Hydrogen Gas ◽

Aluminum Alloy 6061 ◽

Intermetallic Particles ◽

Alloy 6061 ◽

Pressure Hydrogen

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Feasibility study of hydraulic cylinder subject to high pressure made of aluminum alloy and composite material

Composite Structures ◽

10.1016/j.compstruct.2018.11.021 ◽

2019 ◽

Vol 209 ◽

pp. 739-746 ◽

Cited By ~ 8

Author(s):

Luigi Solazzi

Keyword(s):

High Pressure ◽

Composite Material ◽

Aluminum Alloy ◽

Feasibility Study ◽

Hydraulic Cylinder

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Production of alumo-matrix composite material modified by nanostructured cubic boron nitride

Proceedings of the National Academy of Sciences of Belarus Physical-Technical Series ◽

10.29235/1561-8358-2018-63-3-271-279 ◽

2018 ◽

Vol 63 (3) ◽

pp. 271-279

Author(s):

P. A. Vityaz ◽

V. T. Senyut ◽

M. L. Kheifetz ◽

A. G. Kolmakov

Keyword(s):

High Pressure ◽

Aluminum Alloy ◽

Boron Nitride ◽

Cubic Boron Nitride ◽

Aluminum Matrix ◽

Treatment Temperature ◽

Chemical Affinity ◽

High Temperature Annealing ◽

High Pressure And Temperature ◽

Primary Particles

The structure and microhardness of an aluminum alloy with additives of nanostructured cubic boron nitride (cBN) after treatment under high pressure and temperature are investigated. А nanostructured powder of cBN with primary particles within 50–200 nm is used as a filler. A preliminary chemical-thermal modifying of the nanostructured cBN, which consists in its high-temperature annealing in the temperature range of 750–950 °C in a medium of aluminum-contai ning compounds, is carried out to increase the chemical affinity of the nanostructured cBN to the aluminum matrix. It is shown that the modifying of nanostructured cBN with aluminum increases the strength of the additives retention in the aluminum matrix. At the same time the increase in the concentration of BN additives from 1.5 to 5 wt.% as well as the increase in the treatment temperature at a fixed pressure promotes the increase in the microhardness of the material by a factor of 1.5 to 2 as compared with the base aluminum alloy without the addition of a modifier. An increase in the cBN concentration to 5 % by weight results in an increase in the fraction of smaller particle conglomerates (1–5 μm) in the material and in a decrease in the size of large inclusions to 10–20 μm. In this case, the distribution of BN particles in the aluminum matrix is more uniform in comparison with a material with a cBN content of 1.5 wt.%. In the material with the growth of temperature up to 1000 °С, cBN in aggregates is recrystallized with the formation of single-crystal (polycrystalline) particles with the size of 1–10 μm with faceting specific for cBN micron particles.

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