超重力场与钠盐变质对Al-12Si合金共晶组织及硬度的影响

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英文篇名：Effects of Super-gravity Field and Sodium Salt Metamorphism on Eutectic Structure and Hardness of Al-12Si Alloy 作者：蒋攀辉 ; 甘章华 ; 华称文 ; 孙瑶 ; 卢志红 英文作者：Jiang Panhui;Gan Zhanghua;Hua Chengwen;Sun Yao;Lu Zhihong;The State Key Laboratory of Refractories and Metallurgy,School of Materials and Metallurgy,Wuhan University of Science and Technology; 关键词：超重力场 ; 钠盐变质 ; Al-12Si合金 ; 共晶Si ; 硬度 英文关键词：High Gravity Field;;Sodium Salt Metamorphism;;Al-12Si Alloy;;Eutectic Silicon;;Hardness 中文刊名：TZZZ 英文刊名：Special Casting & Nonferrous Alloys 机构：武汉科技大学材料与冶金学院省部共建耐火材料与冶金国家重点实验室; 出版日期：2018-06-20 出版单位：特种铸造及有色合金 年：2018 期：v.38;No.303 基金：国家自然科学基金资助项目(11574242) 语种：中文; 页：TZZZ201806031 页数：5 CN：06 ISSN：42-1148/TG 分类号：115-119

摘要

利用离心机研究了超重力场对未变质及经钠盐变质的Al-12Si合金共晶组织及显微硬度的影响。结果表明,超重力场可使未变质Al-12Si合金心部共晶Si显著细化和颗粒化,且在4 000g(g=9.8 m/s~2)超重力场下凝固时效果最好,此时心部共晶Si大部分呈颗粒状,直径约为0.7μm;而经钠盐变质合金在超重力场下凝固时,心部共晶Si细化和颗粒化程度更高,且在超重力场达到3 000g时效果最佳,此时心部共晶Si基本为颗粒状,直径约为0.3μm;随重力场加大,未变质合金心部硬度(HV)逐渐提高,在4 000g时达到最大值72;而经钠盐变质合金在超重力场下凝固时心部硬度(HV)提高更为明显,且在3 000g时达到最大值88。
        The effects of super-gravity field on the eutectic microstructure and microhardness of Al-12 Si alloy without modification and with sodium modification were investigated by centrifuge.The results reveal that,the central eutectic silicon in the un-modified Al-12 Si alloy can be refined significantly and granulated in the super-gravity field,and most of the central eutectic silicon presents granular with a diameter of about 0.7μm with solidified at 4 000 g(g=9.8 m/s~2).In addition,the central eutectic silicon can be refined and granulated to a higher degree under compound action of super-gravity field and sodium salt metamorphism,and the central eutectic silicon is basically granular with a diameter of about 0.3μm when the super-gravity field reaches 3 000 g.With the increase of gravity field,the central hardness(HV)of the un-modified alloy is increased gradually and reaches the maximum value of 72 at 4 000 g.The central hardness(HV)is increased more obviously when the sodium salt metamorphic alloy is solidified in the super-gravity field and reaches the maximum value of 88 at 3 000 g.

引文

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