【摘 要】
：
The effect of the elastic strain energy on the core-shell structures was studied in an Al-0.06 Sc-0.02 Er (at.%) alloy.A theoretical model for the calculati
【出 处】
：
第十六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 effect of the elastic strain energy on the core-shell structures was studied in an Al-0.06 Sc-0.02 Er (at.%) alloy.A theoretical model for the calculation of the elastic strain energy caused by core-shell precipitates,which is applicable to materials with weak elastic anisotropy,is adopted.It is demonstrated that the partitioning of Er to the precipitate core does not reduce the elastic strain energy as expected in the previous study.However,the resistance due to the elastic strain energy to form an Al3(Sc0.36Er0.64)-Al3(Sc0.8Er0.2) core-shell precipitate is quite small,and can be easily overcome by the decrease of the total interfacial energy,which is consistent with the previous experimental results.On the other hand,the resistance due to the elastic strain energy to form an Al3Er-Al3Sc core-shell precipitate is much larger than that to form an Al3(Sc0.36Er0.64) -Al3(Sc0.8Er0.2) core-shell precipitate,thus the partitioning of all the Er atoms to the core is strongly hindered by the elastic strain energy and was not observed in the experiment of the previous study.
其他文献
一串红本属多年生草本花卉,但因其畏寒,多做一年生栽培,花期一般在6月以后。而若采用插枝过冬法栽培,不仅可使花期提前,还能做到一年三度开花。扦插时间 10～11月,剪取长15～20
本工作采用平衡合金法,通过扫描电镜和能谱分析(SEM-EDS)、X射线衍射(XRD)等手段测定了Fe-Cr-Ni-Al四元系900℃70at.％Fe截面的相关系.研究发现该等温截面含有3单相区：α(α
During the past decade,we have studied the phase stabilities and phase equilibria in ternary systems based on titanium.Titanium alloys are very important ma
在考虑尺寸效应的基础上，本工作将Sutherland公式与Kaptay黏度公式和Proptopapas随温度变化的有效直径公式进行结合成功预测了Co-Ti-W-Ta液相自扩散和杂质扩散系数，并建立
扩散是固体物质中一种最常见的现象，它会影响金属很多性能，因而扩散系数也成为研究金属材料很重要的参数。本文通过第一原理结合冻声子方法，计算了Al-Cu-Mg体系fcc相扩散矩
寒区土壤的导热特性与土壤的组成结构和孔隙数量、大小及其内部物质的相态等因素有关。本文以孔隙度作为代表性状态变量,给出了含冰非饱和土壤的表征单元体(REV)选取方法,建立了2个考虑冻融的条件的含冰非饱和土壤导热分析的REV模型:简化体积加权REV模型和精细体积加权REV模型,据此给出了宏观导热分析模型;并以冬季寒区土壤为例进行了土壤导热分析计算,讨论了含冰非饱和土壤导热系数与相关参数(孔隙率、含水率
Drastically different two-phase microstructures have been reported for alloy epitaxial films,including self-organized nanoscale concentration modulations of
本工作利用平衡合金法，借助扫描电镜与能谱仪(SEM-EDS)，以及X射线衍射仪(XRD)等手段测定了Zn-Al-Co系600℃和800℃等温截面。
近10年来肠道蠕虫感染被认为是一个可以解决的重要公共卫生问题。新的抗蠕虫药物因具有广谱和单剂应用的优点起了主要的作用。蛔虫、鞭虫和钩虫虽少致死亡,但对儿童的营养、
登革热是由登革病毒经蚊媒传播的一种急性传染病。广泛分布于热带和亚热带,在东南亚、西太平洋及加勒比海地区常发生流行和爆发。近年来世界范围内大部分热带地区的登革热或