【摘要】：在高壓模鑄AA5754合金前,分別采用超聲處理和電磁攪拌或兩者組合使用對(duì)熔體進(jìn)行處理,并對(duì)其影響進(jìn)行評(píng)定。經(jīng)超聲處理、電磁攪拌或組合處理后的合金熔體被轉(zhuǎn)移至注射腔。對(duì)合金的晶粒尺寸、力學(xué)性能、含氣量和熱裂敏感性進(jìn)行分析。結(jié)果表明,各種熔體處理方法都能使合金的晶粒細(xì)化,孔隙率減小。超聲處理使合金晶粒從140μm減小至82μm,孔隙率從5.5%減小至1.4%。電磁攪拌使合金晶粒減小至107μm,孔隙率減小至3.3%。組合處理使合金晶粒和孔隙率降至該合金采用物理熔體處理方法有報(bào)道以來的最低值,分別為65μm和1.1%。強(qiáng)烈的空化效應(yīng)和攪拌不僅可以得到細(xì)化的顯微組織,而且也減小熱裂敏感性,提高力學(xué)性能。以上特征都是由于在熔體處理過程中產(chǎn)生空洞。通過組合處理,電磁攪拌在強(qiáng)烈的超聲空化場(chǎng)中提供更多外生顆粒以促進(jìn)形核。超聲處理通過引入強(qiáng)烈的空化場(chǎng),在晶粒細(xì)化、減小熱裂敏感性和含氣量過程中起主要作用。
[Abstract]:The melt of AA5754 alloy was treated by ultrasonic treatment, electromagnetic stirring or both before high pressure die casting, and the effect was evaluated. The melt was transferred to the injection chamber after ultrasonic treatment, electromagnetic stirring or combination treatment. The grain size, mechanical properties, gas content and thermal cracking sensitivity of the alloy were analyzed. The results show that all kinds of melt treatment can refine the grain and reduce the porosity of the alloy. The ultrasonic treatment can reduce the grain size from 140 to 82 micron, and the porosity from 5.5% to 1.4%. Electromagnetic stirring can reduce the grain size to 107 micron and the porosity to 3.3%. The combined treatment can reduce the grain size and porosity of the alloy to 3.3%. Intense cavitation and stirring can not only refine the microstructure, but also reduce the thermal cracking sensitivity and improve the mechanical properties. All these characteristics are due to the formation of voids in the melt treatment process. Electromagnetic stirring (EMS) is strongly super-intense through combination treatment. More exogenous particles are provided in the acoustic cavitation field to facilitate nucleation. Ultrasonic treatment plays a major role in grain refinement, reducing cracking sensitivity and gas content by introducing a strong cavitation field.
【作者單位】： Department
【分類號(hào)】：TG292

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 ;Effect of low-frequency electromagnetic field on the as-cast microstructure of a new super high strength aluminum alloy by horizontal continuous casting[J];China Foundry;2005年01期

【共引文獻(xiàn)】

相關(guān)期刊論文 前3條

1 R.HAGHAYEGHI;;外力對(duì)高壓模鑄AA5754合金組織演變和力學(xué)性能的影響（英文）[J];Transactions of Nonferrous Metals Society of China;2017年02期

2 Xue-yi Fan;Liang Wang;Zhi-qiang Du;Yan-qing Su;Jian-bing Zhang;Liang-shun Luo;Zu-chuan Liu;Da-ming Xu;Jing-jie Guo;;Effect of excitation current intensity on mechanical properties of ZL205A castings solidified under a traveling magnetic field[J];China Foundry;2015年03期

3 ;Study on traveling magnetic field casting of sheet components[J];China Foundry;2010年03期

，

本文編號(hào)：2242935