X.H. Gao
,
K.M. Qi
,
R.L. Li
,
C.L. Qiu
,
B. Ma and G.R. Bai Department of Metal Forming
,
School of Materials and Metallurgy
,
Northeastern University
,
Shenyang 110006
,
China
金属学报(英文版)
Commercial grain oriented silicon steels 0 30mm thick were cold rolled to thinner than mm by the cross shear rolling (CSR) and the conventional rolling respectively, then annealed in a normal hydrogen atmosphere furnace. The influence of the process parameters on rolled textures and the magnetic property of thin silicon steel sheets were investigated. The results indicated that the cross shear rolling was beneficial to improve the rolled textures and the magnetic property of the thin silicon steels. The amount of nucleus of Goss grain increased with increasing the mismatch speed ratio; in addition, magnetic properties were improved further with increasing reduction rate, meanwhile, rolled textures tend to well distributed through the thickness of the sheet.
关键词:
cross shear rolling
,
null
,
null
,
null
金贺荣
,
杨旭坤
,
宜亚丽
材料工程
doi:10.11868/j.issn.1001-4381.2016.08.017
从微观组织和显微硬度两方面对真空热轧316L‐Q345R不锈钢复合板试样性能进行评价。采用电子显微和能谱分析技术，对试样进行微观组织特征观察和成分含量测定，研究相结构及成分变化规律。通过硬度测试仪对复合板界面附近硬度进行测量，研究微观组织与硬度关系。结果表明：热轧后复合板 Q345R侧显微组织以铁素体和珠光体为主，316L侧显微组织为单一奥氏体，一部分晶粒呈孪晶状态，Q345R低合金钢和316L不锈钢经过热轧可良好复合，复合界面平直；界面两侧元素存在扩散现象，不锈钢中Cr ，Ni元素向低合金钢侧扩散，在界面形成富Cr ，Ni薄层，低合金钢中C向不锈钢侧产生少量迁移；在复合界面处的硬度值较大，低合金钢侧远离界面位置复合板硬度与Q345R本身硬度值接近，而从界面到不锈钢侧硬度呈现先下降后上升至稳定的趋势。
关键词:
不锈钢复合板
,
金相组织
,
元素扩散
,
硬度
刘宝龙
,
张慧芳
,
肖振兴
,
吕知清
,
傅万堂
,
任廷志
钢铁
doi:10.13228/j.boyuan.issn0449-749x.20160535
利用扫描电子显微技术结合能谱分析对316L/Q345R热轧复合板结合界面组织及元素扩散情况进行了检测,通过热力学计算分析了界面附近碳的分布规律,并测量了结合界面的显微硬度与剪切强度.结果表明,结合界面碳钢一侧存在约50μm的铁素体带,而不锈钢侧存在约100μm的元素扩散影响区;不锈钢中铬、镍等元素向碳钢中扩散,碳钢中碳元素向不锈钢中扩散;复合板界面剪切强度为373 MPa,明显高于标准规定的210 MPa,略低于Q345R与316L剪切强度和的1/2(379 MPa).
关键词:
不锈钢复合板
,
界面组织
,
元素扩散
,
硬度
,
剪切强度
孙顺平
,
李小平
,
于赟
,
卢雅琳
,
臧冰
,
易丹青
,
江勇
中国有色金属学报
运用第一原理平面波赝势方法计算L12-Al3Li金属间化合物点缺陷的形成焓,并结合Wagner–Schottky模型,研究L12-Al3Li金属间化合物在523、673、823和1000 K时点缺陷浓度与成分之间的关系.结果表明:在这4个温度下,L12-Al3Li金属间化合物中Al空位浓度最小,Li空位浓度次之,Al反位和Li反位的缺陷浓度较大.Al反位和Li反位缺陷浓度在理想金属间化合物Al3Li化学计量比成分处基本相同,不过两种反位的缺陷浓度随着合金成分相对于化学计量比成分的偏离而变化显著,在富Al端Al反位缺陷浓度较大,在富Li端Li反位缺陷浓度较大.运用Arrhenius方程计算点缺陷的有效形成焓,结果显示Al反位和Li反位的有效形成焓较小且基本相同,Li空位次之,Al空位最大.
关键词:
Al3Li金属间化合物
,
第一原理计算
,
点缺陷浓度
,
形成焓
,
Wagner–Schottky模型
米超辉
,
崔斌
,
游桥明
,
畅柱国
,
史启祯
功能材料
以Li2O-SiO2（LSO）复合组分作为助烧剂,比较纳米掺杂和直接掺杂对X7R型BaTiO3基陶瓷显微结构和介电性能的影响,并进一步研究直接掺杂LSO的用量及烧结温度的影响,同时通过缺陷化学理论探讨了陶瓷的烧结机制。实验结果表明与纳米掺杂相比,直接掺杂助烧剂能够使掺杂元素进入晶格产生离子空位等缺陷,减少了物质迁移所需的活化能,从而有效促进陶瓷致密化过程,显著改善陶瓷的微观形貌及其介电性能。陶瓷样品的介电常数随着LSO助烧剂掺杂量的增加先增大后减小;当助烧剂掺杂量为0.08%（摩尔分数）时,样品可在1200℃烧结,室温介电常数达到4855,且容温特性满足X7R标准。通过直接掺杂能够使助烧剂十分均匀地分布在陶瓷材料中,可以显著减少助烧剂的用量,达到明显降低烧结温度的目的,并起到助烧兼改性的作用。
关键词:
纳米掺杂
,
直接掺杂
,
Li2O-SiO2
,
BaTiO3
刘玉林
,
张匀
,
赵洪恩
,
胡壮麒
,
师昌绪
金属学报
本文阐述了定向凝固参数对8090Al-Li合金固液界面形态和溶质偏析行为的影响。结果表明:当下拉速度R<0.13mm/min(温度梯度G_L=130℃/cm)时,可得到平面凝固组织,当R>0.75mm/min(G_L=130℃/cm)时,可获得枝晶组织,且R越大,枝晶越细小。胞晶组织存在范围很窄,元素Cu偏析较严重,杂质元素Fe,Si也有很大偏析,界面形态对溶质偏析行为有显著影响。以粗枝晶凝固时,偏析比较大,凝固组织粗大。
关键词:
Al-Li合金
,
unidirectional solidification
,
interface morphology
,
solute segregation
,
alloy 8090
Journal of Magnetism and Magnetic Materials
The temperature dependence of the anisotropy field H(A) and the thermal expansion DELTA-l/l0 of R2Fe14X (R = Gd, Lu; X = B,C) were measured by applying the SPD technique for H(A)(T) and a membrane technique for DELTA-l(T)/l0. Comparing Lu2Fe14B and Lu2Fe14C the difference in the temperature dependence of H(A) is associated with the difference in the Invar-like thermal expansion between the two compounds.
关键词:
3d magnetism;anisotropy;gd2fe14b
Communications in Theoretical Physics
The unified theoretical calculation of thermal shifts (TS) of R-1 and R-2 lines and thermal broadenings (TB) of R, R' and B lines for ruby was carried out for the first time. The calculated results are in very good agreement with a great number of experimental data. Especially by using quantum theory and taking into account all the admixtures of wavefunctions within d(3) electronic configuration, all the Gamma M in electron-phonon interaction (EPI), the electronic energy spectrum and lattice-vibration Spectrum, the very important contributions to TS and TB from single-phonon direct process were theoretically calculated in detail. The microscopic essentials of various contributions are revealed, and the mistakes in previous work are remedied.
关键词:
diamond anvil cell;pressure measurement;spectroscopy;temperatures
