【摘 要】
:
The liquidus surface projection of the Al-Fe-V system was investigated using X-ray powder diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive spectrometer (EDS).In addition, t
【出 处】
:
第十七届全国相图学术会议暨相图与材料设计国际研讨会
论文部分内容阅读
The liquidus surface projection of the Al-Fe-V system was investigated using X-ray powder diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive spectrometer (EDS).In addition, the Al-Fe-V system was preliminarily assessed by means of the CALPHAD technique on the basis of experimental isothermal section at 773 K in literature and experimental liquidus surface projection in the present work.The solution phases (liquid and bcc) were treated as the substitutional solution.The compounds, Al10V, Al8V5, Al7V, Al3V, Al23V4, AlFe, Al5Fe2, Al13Fe4, and Al2Fe, which had a homogeneity range of the third element Fe or V, were treated as the formulae, Al10(Fe,V), Al8(Fe,V)5,Al7(Fe,V),Al3(Fe,V), Al23(Fe, V)4, Al(Fe,V),Al5(Fe,V)2,Al13(Fe, V)4, and Al2(Fe,V),by two-sublattice model with Al on the first sublatttice and Fe and V on the second sublatttice.The preliminary thermodynamic parameters of the Al-Fe-V system were obtained.
其他文献
本工作利用真空电弧炉成功制备了Dy-Mn-Sb三元系合金试样,综合利用X射线粉末衍射、扫描电镜和能谱分析等方法测定了Dy-Mn-Sb三元系合金773K等温截面相图.发现了一个新的三元化合物Dy3MnSb7,Mn在Dy5Sb3中的最大固溶为3.6 at.% Mn.MnSb的固溶范围为49.5-54 at.% Mn.
采用感应加热定向凝固设备制备了大尺寸(Φ50mm× 100mm)Fe82Ga18-xAlx(x=9.5、8.5)合金棒,研究了合金不同热处理工艺对晶体结构、微观组织、磁致伸缩性能的影响.结果表明:不同热处理工艺对Fe82Ga18-xAlx合金的磁致伸缩性能影响也是不一样的,x=9.5的Fe82Ga18-xAlx合金730℃热处理磁致伸缩性能最好,x=8.5的合金600℃热处理磁致伸缩性能最好.
采用区熔定向凝固的方法,制备了大尺寸(50 110mm)的Tb0.26Dy0.54Ho0.2Fe1.9合金棒.研究了大尺寸合金棒的显微结构、组织及磁致伸缩性能.研究表明,大尺寸合金棒具有MgCu2型立方Laves相结构;沿大尺寸合金棒径向,位于次表层样品的显微组织富稀土相成片层状沿一定方向连续生长;沿大尺寸合金棒外表层轴向(记为y方向),位于y=1/2处,磁致伸缩系数最大,可达到1000ppm,长
碳基等低维纳米材料具有比表面积大,快速的吸放氢动力学等优点而在储氢材料领域尤为受到重视.但该类材料仅在低温(液氮温度)下才表现出较好的储氢能力.通常采用化学修饰的方法来改善这类材料的储氢性能.采用基于密度泛函理论的第一原理计算预测了Ca修饰的一种新型单层硼片的储氢性能.研究发现:每个Ca可以吸附6个H2分子,吸附能在较优的0.20至0.32 eV能量范围;当此新型硼片双侧均用Ca修饰后,其储氢含量
In order to develop new Co-base superalloys and understand the relationships between microstructures and properties in the Co-V-Ta ternary system, four isothermal sections of the Co-V-Ta ternary syste
材料制备过程微结构演变的定量描述是材料设计的核心.近年来基于精准热力学和扩散动力学数据库的相场模拟是对微结构演变进行定量描述一种行之有效的方法.本工作选取6×××系AlMgSi工业合金为研究对象,实验测定了定向凝固过程不同抽拉速率下的微观组织结构.随后基于本课题组所建立的铝合金热、动力学数据库,采用相场法对6×××系AlMgSi合金定向凝固过程不同抽拉速率下的微结构演变进行模拟,模拟结果与实测数据
含Re单晶高温合金热处理时,合金元素Ni和Al等的蒸发及凝结对其微观组纵演变有看重要影响,Ni元素和Al元素在一定程度的贫化改变了合金表面的化学成分,这造成富含难熔元素沉析相的生成以及基体γ相的分解.一方面,次表层元素的蒸发及互扩散造成了γ和针状的拓扑密堆相间歇性的发生反应(二次反应);其次,二次反应区晶界的推移仅仅取决于晶界前沿处的溶质过饱和度.采用吉布斯自由能变计算了二次反应区晶粒长大的驱动力
1.Introduction The Tb0.3Dy0.7Fe2 magnetostrictive material possesses a large magnetostriction and low anisotropy constant, K1, and is of significant interest for applications in transducers and sensor
亚稳-Ti合金的结构稳定性通常采用Mo当量方法来表征,该方法以强形成元素Mo作为标准,将其它合金化元素的含量换算成与Mo的相当含量,其比值(当量系数)则代表该元素的对的稳定能力.然而,目前常用的Mo当量公式是从实验中获取,仍需要对合金化元素的的稳定能力(元素当量系数)进一步理解.本文工作根据Ti-M相图特征信息提出了一个新的Mo当量公式,利用Ti-M二元相图富Ti处的特殊成分点(偏析点、共析点等)
The Ce-Co-Sb ternary alloys of various compositions were prepared by high frequency melting technique after sealing the constituent components in the vacuum quartz tube in case of the volatility of an