Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第26卷    第6期    总第207期    2016年6月

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文章编号:1004-0609(2016)-06-1167-08
振动频率对间接超声辅助铸造Al-24%Si合金的影响
赵龙志,李 洋,张 坚,赵明娟

(华东交通大学 机电工程学院 载运工具与装备教育部重点实验室,南昌 330013)

摘 要: 采用间接超声振动辅助铸造法制备Al-24%Si合金(质量分数),利用金相显微镜、电子万能试验机、磨损试验机、扫描电镜和显微硬度计分别研究超声波频率对合金的显微组织、抗压强度、磨损性能和显微硬度的影响。结果表明:施加20.4 kHz的超声处理对合金中初晶硅和共晶硅的细化作用最佳,初晶硅平均尺寸为100 μm,共晶硅平均尺寸为40 μm;随着超声频率的增大,合金抗压强度先增大后减小,磨损率先减小后增大;磨损机制主要为磨粒磨损和粘着磨损;合金的显微硬度先增大后减小,与合金中硅相尺寸呈负相关关系。

 

关键字: Al-24%Si合金;显微组织;超声频率;抗压强度;磨损性能;显微硬度

Influence of vibration frequency on indirect ultrasonic aided casting Al-24%Si alloy
ZHAO Long-zhi, LI Yang, ZHANG Jian, ZHAO Ming-juan

Key Laboratory of Ministry of Education for Conveyance and Equipment,
School of Mechatronics Engineering, East China Jiaotong University, Nanchang 330013, China

Abstract:Al-24%Si alloy was prepared by indirect ultrasonic aided casting method. With metalloscope, vertical electronic universal testing machine, abrasion tester, scanning electron microscope and microhardness tester, the influences of ultrasonic frequency on the microstructure, compressive strength, wear performance and hardness of the alloy were investigated. The results show that 20.4 kHz ultrasonication has the best refining effect on the alloy primary silicon and eutectic silicon with average sizes are 100 and 40 μm, respectively. Along with the increase of ultrasonic frequency, the compressive strength increases first and then decreases, while the wear rate decreases first and then increases. Furthermore, the wear mechanism of the alloy is mainly represented as abrasive wear and adhesive wear. Additionally, the alloy microhardness increases first and then decreases along with the increase of ultrasonic frequency, and has a negative correlation with grain size of silicon in the alloy.

 

Key words: Al-24%Si alloy; microstructure; ultrasonic frequency; compressive strength; wear property; microhardness

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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