检索结果-南通市图书馆

Rare Metals 2006年第2期25卷 177-183页

作者： LIU Zheng MAO Weiming ZHAO Zhengduo Material of Science and Engineering School University of Science and Technology Beijing Beijing 100083 China Faculty of Material and Chemical Engineering Jiangxi University of Science and Technology Ganzhou 341000 China

The semi-solid slurry of a hypoeutectic al-si alloy was manufactured by low superheat pouring and weak electromagnetic stirring. The effects of pouting temperature and stirring power on the semi-solid slurry were investigated. The results indicated that the semi-solid slurry to satisfy rheocasting can be manufactured by low superheat pouring and weak electromagnetic stirring. The pouring temperature （or superheat） and the stirring power remarkably affected the morphology of primary α-al and the size of primary α-al, and there is no obvious effect of stirring time on primary α-al. Compared with the samples made by low superheat pouring with no stirring, the nucleation rate, particle morphology and grain size of primary α-al in A356 were markedly improved by low superheat pouring and weak electromagnetic stirring. On the condition of weak electromagnetic stirring, the pouring temperature with low superheat can be suitably raised to reach the effectiveness obtained from the lower pouring temperature without stirring.

关键词： semi-solid low superheat pouring weak electromagnetic stirring hypoeutectic al-si alloy A356 al alloy

Research on high strength hypoeutectic al-si alloy

在线全文

学校读者我要写书评

暂无评论

Research on high strength hypoeutectic Al-Si alloy

Nucleation and growth of eutectic cell in hypoeutectic al-si alloy

第八届中国功能材料及其应用学术会议

作者： JIA Ting-ting CHEN Guo-shi ZHANG Shuo WU Ming GENG Hao-ran School of Materials Science and Engineering University of Jinan

ISBN: (纸本)9783037859698

In this study,hypoeutectic al-si casting alloy was investigated to obtain high strength,according to alloying of Cu Mg,refining of al-5Ti-B master alloy,modifing of Re and T6 heat *** experimental results show that the mechanicalproperties of the tested alloy reach peak when addition of al-5Ti-1B alloy is 1.0%after heat treatment,especially the yield strength,correspondingly,microstructure distribution gets to the best *** al-5Ti-1B exceeds1.0%,the mechanicalproperties descend *** metalliccompounds of Mgsi phase,CuA1 phase and W phase precipitated along the grain boundary and strengthened dispersively can improve mechanical propertiesof the tested *** yield strength of samplesadded 0.1%Re(La 50%,Ce 40%) increases slightly,simultaneously,the tensile strength and elongation *** 0.1%Re,the mechanicalproperties get down.

关键词： hypoeutectic al-si alloy al-5Ti-1B T6 heat treatment mechanical properties

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2011年第10期21卷 2186-2191页

作者：孙瑜庞绍平刘学然杨子润孙国雄盐城工学院材料学院盐城224051 东南大学材料学院南京210096

The nucleation and growth of eutectic cell in hypoeutectic al-si alloy was investigated using optical microscopy and scanning electron microscopy equipped with electron backscattering diffraction（EBSD）.By revealing the eutectic cells and analyzing the crystallographic orientation,it was found that both the eutectic si and al phases in an eutectic cell were not single crystal,representing an eutectic cell consisting of small ＇grains＇.It is also suggested that the eutectic nucleation mode can not be determined based on the crystallographic orientation between eutectic al phases and the neighboring primary dendrite al ***,the evolution of primary dendrite al phases affects remarkably the following nucleation and growth of eutectic *** coarse flake-fine fibrous transition of eutectic si morphology involved in impurity elements modification may be independent of eutectic nucleation.

关键词： hypoeutectic al-si alloy eutectic cell nucleation growth

Effects of si Content and the Addition Amount of al-3B Master alloy on the Solidification Structures of hypoeutectic al-si alloys

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2001年第3期20卷 168-173页

作者： Donghui Wang,Jianguo Li, Yankang Zheng, Bingzhe Bai Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China Tsing Hua Univ Dept Mat Sci & Engn Beijing 100084 Peoples R China

Effects of si content and the addition amount of al-3B master alloy on the solidification structures of hypoeutectic al-si alloys were studied. The addition amounts of the master alloy were 0.2%, 0.4%, 0.7% and 1% (mass fraction, so as the follows), respectively. The si content of al-si binary alloys investigated varied from 1% to 11%. The observation of macrostructures of non-refined samples showed that 3% si constitutes a transition point at which the minimum grain size can be obtained. It was also found that al-3B master alloy can shift the transition point towards a higher si value when its addition amount increases, making this point appear at 4%, 5% and 6% si as its addition amount increases up to 0.4%, 0.7% and 1%, respectively.

关键词： al-3B master alloy hypoeutectic al-si alloy grain refinement

Effect of slow shot speed on externally solidified crystal,porosity and tensile property in a newly developed high-pressure die-cast al-si alloy

在线全文

学校读者我要写书评

暂无评论

China Foundry 2024年第1期21卷 11-19页

作者： Wen-ning Liu Wei Zhang Peng-yue Wang Yi-xian Liu Xiang-yi Jiao Ao-xiang Wan Cheng-gang Wang Guo-dong Tong Shou-mei Xiong School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Key Laboratory for Advanced Materials Processing Technology Tsinghua UniversityBeijing 100084Beijing China FAW Group Co. Ltd.Changchun 130013China China FAW Foundry Co. Ltd.Changchun 130013China

The effect of slow shot speed on externally solidified crystal(ESC),porosity and tensile property in a newly developed high-pressure die-cast al-si alloy was investigated by optical microscopy(OM),scanning electron microscopy(SEM)and laboratory computed tomography(CT).Results showed that the newly developed alsi9MnMoV alloy exhibited improved mechanical properties when compared to the alsi10MnMg *** alsi9MnMoV alloy,which was designed with trace multicomponent additions,displays a notable grain refining effect in comparison to the alsi10MnMg *** elements Ti,Zr,V,Nb,B promote heterogeneous nucleation and reduce the grain size of primaryα-*** a lower slow shot speed,the large ESCs are easier to form and gather,developing into the dendrite net and *** an increase in slow shot speed,the size and number of ESCs and porosities significantly *** addition,the distribution of ESCs is more dispersed and the net-shrinkage *** tensile property is greatly improved by adopting a higher slow shot *** ultimate tensile strength is enhanced from 260.31 MPa to 290.31 MPa(increased by 11.52%),and the elongation is enhanced from 3.72%to 6.34%(increased by 70.52%).

关键词： hypoeutectic al-si alloy high pressure die casting porosity externally solidified crystal tensile property

Microstructure and rheological properties of a semisolid A356 alloy with erbium addition

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2022年第7期40卷 1148-1155页

作者： Chaiyawat Peeratatsuwan Phromphong Pandee Ussadawut Patakham Chaowalit Limmaneevichitr Department of Production Engineering Faculty of EngineeringKing Mongkut's University of Technology ThonburiBangmodTungkhruBangkok10140Thailand Center for Lightweight Materials Design and ManufacturingKing Mongkut's University of Technology ThonburiBangmodTungkhruBangkok10140Thailand National Metal and Material Technology Center National Sciences and Technology Development AgencyThailand Science ParkKlong LuangPathumthani12120Thailand

The effects of erbium addition on the rheological properties and microstructure of a semisolid A356 alloy were *** semisolid slurries were prepared through the serpentine channel technique before they were thixoformed using parallel-plate compre ssion with cylindrical *** grain and globule size decreases as the Er content increases,resulting in an improved and uniform distribution of spherical primaryα-al phase within the semisolid *** addition of the Er modifies the grain morphology and size of theα-al grains,resulting in a better and more uniform distribution of spherical primaryα-AI phase within the semisolid *** a result,rheocast quality index increases with the addition of Er,which is suitable for the thixoforming *** A356 alloy without Er has the highest viscosity *** viscosity decreases,and the flow characteristics of the semisolid feedstock are expected to improve when Er is added as a result of the refinement of primary a-al and modification of eutectic ***,the refined semisolid A356 alloys with Er show a slightly larger fraction of highangle grain boundaries compared to that for the unrefined alloy.

关键词： Erbium Thixoforming Serpentine channel hypoeutectic al-si alloy Parallel-plate compression Rare earths