Cast Al-Si alloy

A technology for casting aluminum-silicon alloys and impurities, which is applied in the field of casting aluminum-silicon alloys, can solve problems such as poor mechanical properties of Al-Si alloys and unheatable die-cast aluminum alloys, and achieve the effects of improving mechanical properties, reducing mold costs and low cost.

Inactive Publication Date: 2006-10-18
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

ZL102 does not contain strengthening element Mg (GB1173-86, ISO3522-1984 standard: σ b ≥170MPa, δ≥3%), die-cast aluminum alloys cannot be heat-treated, so the mechanical properties of eutectic cast Al-Si alloys are poor, which is the main reason for their limited application range

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A cast aluminum-silicon alloy, the composition and ratio of which are as follows: Si: 11.0%-13.5%; Mg: 0.15%-0.55%; Sr: 0.015%-0.080%; B: 0.010%-0.050%; Cu: <0.20 %; Fe: <0.20%; Zn: <0.10%; Mn: <0.10%; Ti: <0.10%; other impurities individually <0.05%, total <0.15%; In this embodiment, Si may be 11.0%, 12% or 13.5%; Mg may be 0.15%, 0.35% or 0.55%; Sr may be 0.015%, 0.045% or 0.080%; B may be 0.010%, 0.030% or 0.050%; Cu: <0.20%, preferably 0.18% or 0.02%; Fe: <0.20%, preferably 0.19% or 0.01%; Zn: <0.10%, preferably 0.19% or 0.015%; Mn: <0.10%, preferably 0.16% or 0.005% %; Ti: <0.10%, can be 0.09% or 0.005%; Mn: <0.10%, can be 0.09% or 0.01%; other impurities individually <0.05%, total <0.15%; balance Al.

Embodiment 2

[0017] The indoor temperature is 20°C and the relative humidity is 20%.

[0018] The alloy formulated according to the chemical composition requirements of the AlSi alloy was melted at 760°C and refined at 730°C with degassing and slag removal, adding Al-10Sr master alloy (market purchase: Nanjing Yunhai Special Metal Co., Ltd.) and Al-3B master alloy ( Purchased from the market: Xuzhou Huayuan Special Material Factory) for Sr+B joint melt treatment, poured into the standard tensile test bar mold (cast iron type, preheating temperature 250-300°C) at 690-710°C, and produced 10 pieces Single-cast test bars (nominal diameter 12mm), 5 of which were heat treated according to the A356 alloy T6 procedure (solution temperature 535±5°C, solution time 6 hours; aging temperature 155±5°C, solution time 3 hours). Tensile experiments were carried out on a WJ-10 mechanical universal testing machine. The chemical composition of the alloy was determined by ICP direct reading spectrometer. Th...

Embodiment 3

[0023] The indoor temperature is 25°C and the relative humidity is 40%.

[0024] The production and measurement process of 10 test rods are the same as in Example 2.

[0025] main chemical composition

[0026] Si: 12.57%; Mg: 0.30%; Sr: 0.045%; B: 0.026%; Fe: 0.18%; Cu: 0.13%; Zn: 0.06%; Mn: 0.07%; Ti: 0.04%; Require.

[0027]

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Abstract

The cast Al-Si alloy consists of Si 11.0-13.5 wt%, Mg 0.15-0.55 wt%, Sr 0.015-0.080 wt%, B 0.010-0.050 wt%, Cu <0.20 wt%, Fe <0.20 wt%, Zn <0.10 wt%, Mn <0.10 wt%, Ti <0.10 wt%, each of other impurity<0.05 wt%, total impurity content<0.15 wt%, and Al the rest. The cast Al-Si alloy has Si content near the eutectic point of the alloy, and its alloy liquid has excellent flowability, powerful shrink feeding capacity, low gas absorption and less casting defaults. The cast Al-Si alloy has high toughness and lowered casting mold cost.

Description

technical field [0001] The invention relates to an Al-Si alloy, in particular to a cast aluminum-silicon alloy used for aluminum alloy wheel hubs of automobiles and motorcycles. Background technique [0002] Cast Al-Si alloy is one of the two traditional structural materials, widely used in aerospace industry, military industry, automobile industry, electric power industry, and machinery industry. Facing the increasingly severe international environment, my country's military industry, aerospace industry, and automobile industry have put forward higher requirements for aluminum castings: small size, light weight, high performance and low cost, requiring cast aluminum alloys to have better formability, more High strength and toughness. At present, the most widely used aluminum alloy castings are A356 alloy (American brand, the corresponding Chinese brand is ZL101A), and eutectic casting Al-Si alloy (Si: 11% ~ 14%) also has certain applications. The automobile and motorcycle ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02
Inventor 廖恒成仇春荔孙国雄
Owner SOUTHEAST UNIV
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