搜索结果: 1-15 共查到“知识库 相图与相变”相关记录207条 . 查询时间(4.651 秒)
单原子插层诱导的铁磁性和非金属-金属相变（图）
单原子 诱导 铁磁性 非金属-金属相变
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2023/1/5
关联过渡金属氧化物由于存在d电子的多种自由度耦合，具有一系列丰富且相互竞争的磁电量子有序态和能量相近的低能激发态，因而蕴含着塑造多维信息载体的可能，而对其磁性和电性态来源的研究和调控是基础。4d钙钛矿结构Ru氧化物SrRuO3和CaRuO3都具有正交钙钛矿晶格结构，且Ru原子均为+4价态，但是它们的物理性质却截然不同。SrRuO3是铁磁（TC=160 K）金属性，CaRuO3具有更强的正交晶格畸变...
The only feasible access to non‐face‐centered cubic (FCC) copper was by physical vapor deposition under high vacuum. Now, non‐FCC copper is observed in a series of alkynyl‐protected Cu53 nanoclusters ...
ASTM A216 WCA铸钢凝固及冷却过程相变的CA模拟
元胞自动机 凝固组织 数值模拟 ASTM A216 WCA铸钢
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2012/3/23
结合Thermo-Calc和Dictra软件考虑了多组元条件下的凝固和溶质扩散过程, 建立了元胞自动机(CA)模型, 对ASTM A216 WCA铸钢凝固及后续冷却过程的相变进行了模拟. 设计了阶梯形试件进行浇注与测温实验, 并用 OM和SEM观察了铸态试件不同部位的微观组织, 测定了先共析α铁素体的含量及其晶粒尺寸、珠光体的层片间距, 并将数值模拟结果和实验结果进行了对比,分析了冷却条件对铸态微...
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...
通过热模拟压缩实验, 研究了铁素体相变前的奥氏体晶粒尺寸对基于动态相变的热轧C-Mn-Al-Si系TRIP钢组织及力学性能的影响. 结果表明, 减小原始奥氏体晶粒尺寸, 可促进动态相变时的铁素体相变动力学, 有利于铁素体、贝氏体及残余奥氏体等相分布更为均匀, 获得的贝氏体束及贝氏铁素体尺寸较小, 残余奥氏体的体积分数及C含量均较高, 细小的颗粒状残余奥氏体数量较多且弥散分布, 因此可获得具有较高强...
Diffused phase transition of polycrystalline (Ba0.80Sr0.20)TiO3
Barium Strontium Titanate X-ray spectroscopy Electron microscopy
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2010/1/11
The purpose of this work was to determinate the influence of the 20% Sr substitutions (in sublattice A) on changes of the character of phase transition (PT) in comparison with pure barium titanate BaT...
Characteristics of phase transitions in Ba0.995Na0.005Ti0.995Nb0.005O3 ceramic
Ceramics Phase transitions Ferroelectrics
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2010/1/11
The purpose of this work was to prepare ceramic material BaTiO3 (BT) as well as solid solution of Ba1-xNaxTi1-xNbxO3 (for x = 0.005) (BNTN05) type and correlate their structural (polycrystalline) prop...
Metallographic preparation of the conventional and new TBC layers
Metallic alloys Thin & thick coatings TBC
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2009/12/3
Purpose: Verification of up-to-now used metallographic preparation of the TBC coating thermal barriers and adaptation of them to layers of new types, based on new ceramic compounds, sprayed on convent...
The influence of the martensite α’ phase occurring in the structure of cold rolled austenitic Cr-Ni steel on its mechanical properties
Metallic alloys Austenitic stainless steel Plastic deformation
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2009/12/3
Purpose: In this paper the mechanical properties and structure of cold rolled austenitic stainless steel X5CrNi18-8
with a draft of 17%-78% were presented.
Design/methodology/approach: The main meth...
The influence of austenitization on grain size and mechanical properties of regenerative G21CrMoV4–6 cast steel
Metallic alloys Mechanical properties Quantitative metallography
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2009/12/2
Purpose: Influence of austenitiziation parameters (temperature and time) on grain size and mechanical properties
of low alloy cast steel have been investigated.
Design/methodology/approach: The grai...
Tool flank wear analyses on martensitic stainless steel by turning
Machining Wear resistance Flank wear
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2009/12/2
Purpose: Purpose of this research was to demonstrate tool wear by hard turning of martensitic stainless steel and
this material is pronounced as difficult to machine material. The evaluation was done...
Diagrams of supercooled austenite transformations of low-carbon and medium-carbon TRIP-steels
Metallic alloys TRIP-steel CCT-diagram Supercooled austenite
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2009/12/2
Purpose: The aim of the paper is to determine the influence of cooling conditions on a structure and a shape of
CCT-diagrams of TRIP-aided steels.
Design/methodology/approach: The diagrams of unde...
Structural analysis of austempered ductile iron obtained by Mössbauer spectroscopy
Austempered ductile iron Mö ssbauer effect Microstructure Austenite
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2009/12/2
Purpose: The composition of metallic matrix in ductile iron as-cast and after austempering at temperatures of
280, 330 and 380oC (ADI) was examined.
Design/methodology/approach: The study presents ...
Effect of retained austenite on the fracture toughness of tempered tool steel
Tool materials Fracture toughness Retained austenite
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2009/12/2
Purpose: This paper is an attempt of reviewing the outlooks about the favourable influence of retained austenite
on fracture toughness of tool steels according to results of investigation concerning ...
Hot rolling of intermetallics FeAl phase based alloys
Plastic forming Iron aluminides Hot rolling
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2009/12/2
Purpose: The one of major problem restricting universal employment of intermetallic phase base alloy is
their low plasticity which leads to hampering their development as construction materials. The ...