(1. 東北大學(xué)材料電磁過(guò)程研究教育部重點(diǎn)實(shí)驗(yàn)室，沈陽(yáng) 110819；
2. 昆山捷安特輕合金科技有限公司，昆山 215335)
摘 要: 采用一種新型定子-轉(zhuǎn)子型強(qiáng)剪切裝置，通過(guò)水模擬實(shí)驗(yàn)和鋁熔體除氣實(shí)驗(yàn)相結(jié)合的方法研究強(qiáng)剪切作用對(duì)鋁合金除氣過(guò)程中氬氣泡的影響規(guī)律，進(jìn)而研究其對(duì)7075鋁合金的除氣作用。結(jié)果表明：強(qiáng)剪切對(duì)氬氣泡具有強(qiáng)烈的破碎和分散作用，能夠?qū)⑼ㄈ肴垠w的氣泡轉(zhuǎn)變?yōu)榉浅＜?xì)小的氣泡，并均勻分布于熔體之中。這種強(qiáng)剪切作用對(duì)7075鋁合金具有非常高效的除氣作用。在適當(dāng)?shù)某龤鈼l件下，經(jīng)過(guò)1 min除氣，合金密度指數(shù)Di由13.20%降低到0.65%，實(shí)測(cè)鋁中氫的含量由2.90 μL/g降低到1.10 μL/g，這顯著優(yōu)于傳統(tǒng)旋轉(zhuǎn)除氣方法。還詳細(xì)研究除氣時(shí)間以及除氣后靜置時(shí)間對(duì)氫含量的影響，并分析強(qiáng)剪切工藝高效除氣的機(jī)理。
關(guān)鍵字: 7075鋁合金；強(qiáng)剪切；除氣；氣泡；氣孔；水模擬
（1. Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education,
Northeastern University, Shenyang 110819, China;
2. Giant Light Metal Technology (Kunshan) Co., Ltd., Kunshan 215335, China）
Abstract:The water simulation and alloy melt degassing experiments were carried out to study the effect of intensive shearing on Ar bubbles and its effect on the degassing of 7075 alloy by the application a newly developed stator-rotor type high shear unit. The results show that the intensive shearing can significantly disperse the Ar bubbles and improve the uniformity of their distribution. The alloy degassing experiments show that the high shearing can evidently degas 7075 aluminium alloy with a high efficiency. Under a proper degassing condition, after degassing for 1 min, the density index decreases from 13.20% to 0.65% and the measured concentration of hydrogen in the melt Al obviously reduces from 2.90 μL to 1.10 μL, which shows a much higher efficiency than that using the conventional rotary degassing method. The effects of the degassing time and isothermal holding time after degassing on hydrogen content were also studied and the mechanism of high efficient degassing of intensive shearing was analyzed.
Key words: 7075 aluminium alloy; intensive shearing; degassing; bubbles; porosity; water simulation
