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为了寻求Nb合金的强度和塑性的平衡，设计了以Nb基固溶体Nbss为主导相的Nb-xSi-6Hf-4Zr-2B-yTi(x=4,8;y=10,30;原子分数)合金，研究了Si和Ti对合金组织和室温力学性能的影响。结果表明，合金由Nbss、Nb3Si和Nb5Si3等3相组成。4Si-(10,30)Ti合金铸态组织是Nb枝晶和分布在枝晶间的硅化物(Nb3Si和Nb5Si3)，8Si-(10,30)Ti...
Al-Si-Mg-Y合金消失模铸造振动压力凝固的组织与性能
Al-Si-Mg-Y合金 消失模铸造 振动压力 组织 性能
2010/9/2
应用消失模铸造振动压力凝固成形技术制备了Al-7Si-0.8Mg-0.3Y(ASMY)合金。通过SEM、XRD、DSC和TEM等测试方法对其铸态和T6组织进行分析，研究其对力学性能的影响。结果表明：在ASMY合金铸态组织的晶界处生成有少量Al3Y短棒状颗粒相；在T6热处理过程中，稀土Y或Al3Y阻碍Mg2Si相的析出和扩散聚集，使析出相Mg2Si呈弥散分布；Mg2Si相与晶界稳定相Al3Y对合金同...
新型Al-Mg-Si-Cu合金的热变形行为及力学性能
Al-Mg-Si-Cu合金 热变形 流变应力 显微组织 力学性能
2010/9/2
采用热模拟研究一种新型Al- Mg-Si-Cu合金的热变形行为，制定该合金的低温快速挤压工艺和在线热处理制度，利用电子万能实验机、光学显微镜、扫描电镜对合金的力学性能和组织进行分析。结果表明：新型Al- Mg-Si-Cu合金为正应变速率敏感材料；该合金的热压缩变形流变应力行为可用双曲正弦形式的本构方程来描述，也可用Zener-Hollomon参数来描述，其变形激活能为189.82 kJ/mol；随...
They say that micro-forming of the crystal alloy is difficult, because the grain boundary makes the formed-surface worse. In the micro-forming, the grain size becomes larger than the size of the die. ...
Nb-Si-Mo三元系合金相图
Nb/Nb Si 原位复合材料 Nb-Si-Mo三元系 相转变 液相面投影图 立体相图
2010/9/7
Nb/Nb5Si3原位复合材料是一种有望替代镍基超合金用做飞机发动机叶片的新一代超高温结构材料。采用非自耗电弧熔炼技术制备出不同成分的Nb/Nb5Si3原位复合材料，利用X射线衍射仪、扫描电镜和能谱仪对Nb-Si-Mo三元系合金的相组成和微观组织进行研究。结果表明：Nb-Si-Mo三元系部分液相面投影图（<37.5 at% Si）含有4个初生相区，其立体相图中存在2个液固四相平衡反应和1个...
Studying of polyoxadiazole with Si atom in the backbone
UV-Vis spectroscopy AFM microscopy IR spectroscopy Spin-coating method Organic polymer
2010/8/17
An application of organic polymers as thin films in optoelectronic devices is wide enough. The most common in this area are semiconducting polymers as polyparaphenylenevinylene (PPV) [1] and polyparap...
Morphological features of retained austenite in thermo-mechanically processed C-Mn-Si-Al-Nb-Ti multiphase steel
Morphological austenite C-Mn-Si-Al-Nb-Ti multiphase steel
2010/8/12
Development of multiphase steels is one of the biggest achievements of contemporary metallurgy in the field of advanced materials for motorization. They are C-Mn-Si, C-Mn-Si-Al, C-Mn-Al-type low-alloy...
Derivative thermo-analysis application to assess the cooling rate influence on the microstructure of Al-Si alloy cast
thermo-analysis assess cooling rate microstructure Al-Si alloy cast
2010/8/12
Copper and magnesium addition enable to perform precipitation hardening of the multicomponent aluminium alloys with silicon, by precipitation of the Al2Cu or Mg2Si phase particles. However copper addi...
研究了低成本制备技术反应熔渗方法制备的SiC/MoSi2和SiC/Mo (Si, Al)2复合材料高温氧化行为。表面氧化物的形态和氧化增重的研究结果表明，所制备复合材料高温氧化3 h 后即发生钝化现象，继续在500℃再进行低温氧化试验，发现限制该材料使用的“Pest”现象消失。其中渗铝复合材料SiC/Mo (Si, Al)2高温增重较渗硅SiC/MoSi2严重。当后者中形成的 SiC增强相全部为原...
The different coating technologies nowadays are more often applied to surface covering of intermediate products and industrial goods [1, 2]. The wear resistant coatings can be also form by the physica...
Microstructures of Mg-Al-Zn and Al-Si-Cu cast alloys
Microstructures Mg-Al-Zn Al-Si-Cu cast alloys
2010/8/11
Recent years’ dynamic development, being present in the automobile industry, is mostly based on innovative constructional solutions as well modern materials, which directly influence mass, performance...
Mn-Si-Cr系中碳钢在过冷奥氏体状态下变形时的显微组织演变
中碳钢 先共析铁素体 球状碳化物 富碳奥氏体区
2010/3/3
将Mn-Si-Cr系中碳钢在过冷奥氏体状态下进行低速率变形, 变形促进先共析铁素体转变, 但未见层状珠光体形成. 铁素体在奥氏体晶界和晶内形核, 以近似等轴状长大、交联, 并分割奥氏体, 形成富碳奥氏体区. 随着变形量的增大, 铁素体可在富碳奥氏体区内部继续形核长大并交联, 导致富碳奥氏体区不断被分割且碳浓度升高, 当碳浓度足够高时, 一次析出球状碳化物可在富碳奥氏体区边界处形成, 尺寸为0.5-...
Corrosion behaviour of Fe-Mn-Si-Al austenitic steel in chloride solution
Corrosion resistance Thermo-mechanical processing High-manganese steels
2009/12/14
Purpose: The aim of the paper is to investigate the corrosion behaviour of the new-developed high-manganese austenitic steel in 0.5n NaCl solution.
Design/methodology/approach: The steel used for the...
Structure investigation of the Al-Si-Cu alloy using derivative thermo analysis
Aluminium alloys Mechanical properties Thermo analysis
2009/12/14
Purpose: This research work presents the investigation results of derivative thermoanalysis performed using the UMSA device (Universal Metallurgical Simulator and Analyzer). The material used for inve...
Structure and mechanical properties of Mg-Si alloys at elevated temperatures
Mechanical properties Magnesium alloys Tensile test at elevated temperatures
2009/12/14
Purpose: of this paper is to extend a complex evaluation of magnesium alloys which requires very often knowledge of structure and mechanical properties at elevated temperatures. These properties are c...