A high-strength anti-fatigue in-situ nano-reinforced aluminum alloy and its die-casting method

An anti-fatigue, aluminum alloy technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of strong plasticity, low anti-fatigue performance, high strength, anti-fatigue, and high damping of high-performance engine components, and achieve Guaranteed die-casting performance, good die-casting performance, and the effect of increasing the content of alloy strengthening phase

Active Publication Date: 2019-04-19
JIANGSU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing typical aluminum alloy AlSi9Cu3 for die-casting has low strong plasticity and fatigue resistance, and especially cannot meet the technical requirements of high-performance engine parts for its high strength, fatigue resistance and high damping. Composition control and in-situ nano-strengthening, combined with the optimized nonlinear high-pressure die-casting method, can increase the content of alloy precipitates, rounding and refining, and at the same time realize the in-situ nano-ceramic reinforcement strengthening in the grain and grain boundary, significantly improving Strong Plasticity, Fatigue Resistance and Damping Properties of Die Casting Products

Method used

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  • A high-strength anti-fatigue in-situ nano-reinforced aluminum alloy and its die-casting method
  • A high-strength anti-fatigue in-situ nano-reinforced aluminum alloy and its die-casting method

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Experimental program
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Effect test

Embodiment 1

[0023] Using Al-10Zr, Al-10B, Al-20Er, Al-20Fe, Al-10Mn master alloys and pure Ni, pure Mg, pure Zn, and AlSi9Cu3 as raw materials, the optimized non-linear high-pressure die-casting technology is used to prepare the automotive engine. Shock bracket.

[0024] The molten 500Kg commercial AlSi9Cu3 alloy (760°C) was transferred to the intermediate holding furnace, then the Al-10Zr and Al-10B intermediate alloys were added to the holding furnace and the temperature was raised to 850°C, while the graphite stirring rotor was used to stir the melt to promote the alloying process. Mix well, keep warm for 15min, then cool the alloy down to 750°C and keep warm; add Al-20Er, Al-20Fe, Al-10Mn and pure Ni into the melt, stir and keep warm for 15min, then put the powder with particle size less than 500μm Shaped composite refining agent blows inert gas into the melt through the hollow channel of the graphite rotor, and refines and degasses the melt to remove the slag inclusions generated durin...

Embodiment 2

[0028] Using Al-10Zr, Al-5B, Al-10Er, Al-10Fe, Al-10Mn master alloys and pure Ni, pure Mg, pure Zn, and AlSi9Cu3 as raw materials, the optimized non-linear high-pressure die-casting technology is used to prepare the automotive engine. Shock shell (the shell structure is complex and difficult to fill and exhaust gas, usually reduce the Mg content, increase the die-casting pressure, improve the performance and yield of die-casting parts).

[0029] Transfer the molten 500Kg commercial AlSi9Cu3 alloy (750°C) into the intermediate holding furnace, then add the Al-10Zr and Al-5B intermediate alloys into the holding furnace and raise the temperature to 840°C, and at the same time use graphite stirring rotor to stir the melt to promote alloying Mix well, keep warm for 10min, then cool the alloy down to 740°C and keep warm; add Al-10Er, Al-10Fe, Al-10Mn and pure Ni into the melt, stir and keep warm for 10min, then put the powder with particle size less than 500μm Shaped composite refin...

Embodiment 3

[0033] Using Al-10Zr, Al-5B, Al-20Er, Al-20Fe, Al-5Mn master alloys and pure NIi, pure Mg, pure Zn, and AlSi9Cu3 as raw materials, using optimized nonlinear high-pressure die-casting technology to prepare oil pumps for automotive engines case.

[0034] Transfer the molten 500Kg commercial AlSi9Cu3 alloy (780°C) into the intermediate holding furnace, then add the Al-10Zr and Al-5B intermediate alloys into the holding furnace and raise the temperature to 860°C, and at the same time use graphite stirring rotor to agitate the melt to promote alloying Fully mixed, the holding time is 15min, then the alloy is cooled to 750°C and kept warm; Al-20Er, Al-20Fe and Al-50Mn and pure Ni are added to the melt, stirred and kept warm for 10min, and the ultrafine powder is refined The inert gas used as agent is blown into the melt through the hollow channel of the graphite rotor, and the melt is refined and degassed to remove the slag inclusions generated during the high-temperature melting an...

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Abstract

The invention relates to an aluminum-based composite material, in particular to a high-strength anti-fatigue in-situ nano-strengthened aluminum alloy and a die-casting method thereof. Die castings are obtained through in-situ nano-strengthening and alloy composition regulation, combined with an optimized nonlinear high-pressure die-casting process. In situ nano-ZrB 2 Reinforcement and Nano-Al 3 The scale effect, interface effect and heterogeneous nucleation effect of Er precipitates significantly improve the strength, fatigue resistance and damping performance of the alloy; at the same time, the content of Mg, Zn and Fe elements is increased, and Mn and Ni elements are introduced, While increasing the content of the strengthening phase and obtaining high strength, the harmful coarse precipitation phases such as Al-Fe are effectively refined and rounded, and the good die casting performance of the alloy is guaranteed; thus, the alloy and the die casting method of the present invention are used to produce the alloy. The components show high strength plasticity, high fatigue resistance, high damping performance and good die casting performance.

Description

technical field [0001] The invention relates to an aluminum-based composite material, in particular to a high-strength anti-fatigue in-situ nano-reinforced aluminum alloy and a die-casting method thereof. Background technique [0002] With the development of economy and society, automobiles have gradually entered the homes of ordinary people and become an indispensable tool for people to travel and live. Statistics from the China Association of Automobile Manufacturers show that in 2016, a total of 10.5286 million Chinese brand passenger cars were sold, a year-on-year increase of 20.50%. The engine is the heart of the car, and the high efficiency, low cost and high performance of its key components have become the core of major car manufacturers to improve their product competitiveness. [0003] With its advantages of high production efficiency, good economy, high casting precision and good surface finish, high-pressure casting gradually replaces high-cost low-pressure and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/02C22C32/00C22C1/10B22D17/00
CPCC22C21/02B22D17/00C22C1/1036C22C32/0073C22C1/1052C22C1/1073B22D21/007B22D21/04C22C1/0416C22C1/1068B22F2999/00B22F1/07
Inventor 赵玉涛怯喜周陈刚殷来大刘海陈飞吴斌
Owner JIANGSU UNIV
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