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自由落体条件下三元Al_(61)Cu_(27)Ag_(12)合金的组织形成 被引量:1
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作者 张彦彦 《铸造技术》 CAS 北大核心 2010年第9期1165-1169,共5页
采用落管无容器处理技术实现了三元Al61Cu27Ag12合金的快速凝固。研究发现,随着合金液滴直径的减小,冷却速率和过冷度均呈指数形式增大。XRD分析表明,自由落体条件下合金凝固组织由η(AlCu)、θ(Al2Cu)和ζ(Ag2Al)三相组成。合金快速凝... 采用落管无容器处理技术实现了三元Al61Cu27Ag12合金的快速凝固。研究发现,随着合金液滴直径的减小,冷却速率和过冷度均呈指数形式增大。XRD分析表明,自由落体条件下合金凝固组织由η(AlCu)、θ(Al2Cu)和ζ(Ag2Al)三相组成。合金快速凝固过程中出现了θ相与ζ相的共生组织,并且随着液滴直径的减小,这种共生组织逐渐增多。结合平衡相图对快速凝固过程进行分析,结果表明,三元Al61Cu27Ag12合金的快速凝固过程可分为:初生η相形成、θ相与ζ相共生组织形成、包晶θ相持续生长和(θ+ζ)共晶生长等四个阶段。 展开更多
关键词 Al-Cu-Ag合金 落管技术 快速凝固 凝固机制
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Overview on Environmental Comprehensive Management System Established in Imitation of Biome 被引量:1
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作者 李如燕 孙可伟 《Journal of Shanghai Jiaotong university(Science)》 EI 2004年第3期88-94,共7页
Environmental comprehensive management system, called “the bionic community”, can be established in imitation of biome, which can transform the wastes generated in a certain field into the raw materials of other fie... Environmental comprehensive management system, called “the bionic community”, can be established in imitation of biome, which can transform the wastes generated in a certain field into the raw materials of other field. The establishment of the bionic community includes two aspects, i.e., the matching technique and the management system. The main matching technique is the preparation of composite materials made of various wastes. This new kind of material can be divided into four types: polymer matrix, silicate matrix, metal matrix and carbon matrix(or ceramic matrix). The environmental comprehensive management system is formed by organizing a trans-trades joint-management business entity with the products of composite material made of wastes at the core. 展开更多
关键词 ENVIRONMENTAL COMPREHENSIVE management IMITATION BIOME
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