材料期刊网

AP-FIM STUDY ON THE MICROSTRUCTURES OF TiAl INTERMETALLIC COMPOUNDS FXBRICATED BY INGOT METALLURGY AND CENTRIFUGAL SPRAY DEPOSITION

D.G. Ren , W.Z. Chen and X.S. Fan ( Laboratory of Atomic Imaging of Solids , Institute of Metal Research , The Chinese Academy of Sciences , Shenyang 110015 , China , College of Materials Science and Engineering , Fuzhou University , Fuzhou 350002 , China)

金属学报(英文版)

The microstructures of TiAl intermetallic compounds prepared by ingot metallurgy and centrifugal spray deposition (CSD) were compared by field ion microscopy and atom probe (AP-FIM). The samples used have nearly stoichiometric composition of TiAl but there is Mn addition for ingot metallurgy (IM) samples and Mn and Nb additions for CSD samples. The field ion image of TiAl showed two regions of ordered f.c.t crystal structure (γ-TiAl) and disordered α-Ti3Al, and the distribution of Ti and Al atoms in TiAl alloy showed a lamellar structure which was confirmed by AP profiles. AP profiles showed that the major constituent of IM TiAl alloy is γ-TiAl with some Ti-rich regions. The compositions of these Ti-rich regions are nearly Ti3Al and Ti2Al from the calculation of AP data. The sample of CSD has a similar microstructure as compared with IM sample. The effects of alloying elements (Mn and Nb) on the ordering extent ,their distribution, and their sites occupied in the lattice were explored for both TiAl alloys. But there are no obvious Ti3Al or Ti2Al phases as shown in IM sample. In addition, the distributions of Mn and Nb concentrations in the CSD sample have a characteristic of wave form.

关键词: intermetallic compound , null , null

Ion sputter erosion in metallic glass-A response to "Comment on: Homogeneity of Zr(64.13)Cu(15.75)Ni(10.12)Al(10) bulk metallic glass" by L-Y. Chen, Y-W. Zeng, Q-P. Cao, B-J. Park, Y-M. Chen, K. Hono, U. Vainio, Z-L. Zhang, U. Kaiser, X-D. Wang, and J-Z Jiang J. Mater. Res. 24, 3116 (2009)

Journal of Materials Research

The morphology of the dark and bright regions observed by transmission electron microscopy for the Zr(64.13)Cu(15.75)Ni(10.12)Al(10) bulk metallic glass strongly depends on the ion beam parameters used for ion milling. This indicates that the ion beam could introduce surface fluctuation to metallic glasses during ion milling.

关键词: room-temperature

Quantitative Analysis of Non-Crystalline and Crystalline Solids in Blast Furnace Slag

WANG Haifeng , ZHANG Chunxia , QI Yuanhong

钢铁研究学报(英文版)

China is short of water seriously. But granulation of blast furnace slag (BFS) with water has many disadvantages, such as high water consumption and difficulty in heat recycling. So developing a new dry granulation technique to treat BFS is very important. The applicability of BFS directly depends on the content of non-crystalline solids in the slag after treatment. So it is of theoretical and practical significance to analyze the content of non-crystalline solids in the slag quantitatively and simply. Metallographical test is mainly adopted to quantify the non-crystalline in BFS now with the shortages such as making sample complexly, determining difficultly and personally. For the diffraction intensity of non-crystalline is proportionate to the content of non-crystalline in BFS, X-ray diffraction method was adopted to quantify the non-crystalline and the crystalline solids in BFS. The quantificational coefficient between the crystalline and the non-crystalline solids of BFS is 0.70 whose main composition is: w（CaO）38.2%，w（SiO2）35.7%，w（Al2O3）16.3%，w（MgO）8.3%. The relatively error of using X-ray diffraction instrument to quantitative analyse non-crystalline content of BFS is less than 1%.

关键词: Blast Furnace Slag;Non-Crystalline;Crystalline;Quantificational Analysis

β晶型成核剂改性纤维级聚丙烯Z30S

窦强 , 王斌

高分子材料科学与工程

研究了β晶型成核剂(酰胺化合物)成核改性纤维级聚丙烯Z30S的力学性能,进行了广角X射线衍射和DSC分析.发现成核改性后生成了β晶型聚丙烯,因而聚丙烯Z30S的冲击性能提高.通过纺丝-拉伸实验和对纤维进行广角X射线衍射分析、SEM观察,发现成核改性纤维在纺丝拉伸过程中发生了晶型转变,产生大量微孔隙.

关键词: 聚丙烯 , β晶型 , 成核剂 , 纤维

211Z.X耐热高强韧铝合金热变形行为及加工图研究

徐祥 , 杨明 , 梁益龙 , 张世伟 , 龚乾江

材料导报 doi:10.11896/j.issn.1005-023X.2016.18.030

在Gleeble-3500热模拟试验机上对211Z.X耐热高强韧铝合金进行了等温热压缩实验,实验的应变温度为350～500℃、应变速率为0.01～10 s-1.研究了不同变形条件下的流变特征,并分析该合金高温变形时流变应力的规律,构建了材料流变应力本构模型;同时基于动态材料模型建立了加工图,确立了该合金在实验条件的最佳工艺参数.结果显示:功率耗散图与失稳图随应变量的增加而变化,功率耗散峰区由3个逐渐减为1个,失稳区域随应变而移动并逐渐增大;在加工图中,随着应变的增大,安全加工区域逐渐减小.综合加工图与微观组织的分析结果,211Z.X铝合金最佳的加工工艺区间为:变形温度485～500℃、应变速率0.03～10 s-1.

关键词: 211Z.X耐热高强韧铝合金 , 热压缩变形 , 加工图

Crystallization kinetics of amorphous solids under pressure

Physical Review B

The pressure effect on crystallization kinetics of amorphous solids was investigated by means of thermodynamic analysis. A model was developed to describe the nucleation process under pressure by considering the crystalline/amorphous (c/a) interface that plays a dominant role in the nucleation process. Applying the model to three types of crystallization process, polymorphous (a-Se), primary (Al89La6Ni5), and eutectic (Ni80P20), we found the calculated results can give reasonable explanations for the experimental observations. The calculation suggests that for a-Se and Ni80P20 amorphous alloy, the initial stage of nucleation is a volume expansion process due to the c/a interface formation, resulting in an increase in the nucleation work with an increment of pressure. Hence the crystallization temperature of the amorphous phase rises when a pressure is applied, while for the Al-La-Ni amorphous alloy, the nucleation barrier decreases at higher pressures. The coincidence between the calculation and the experimental results illustrates that the cia interface formation is the governing factor in the crystallization kinetics of the amorphous solids. [S0163-1829(99)03534-1].

关键词: activation volume;nanocrystalline state;metallic glasses;diffusion;alloy;selenium;phase;se;transformations;microstructure

Amorphous forming ability of Co-X(X=Cr, Mo, W)  magnetic thin films

Gaowu QIN

金属学报(英文版) doi:10.1016/S1006-7191(08)60117-9

Co-X(X=Cr, Mo, W) magnetic thin films were prepared by using DC magnetron sputtering, and their structures were examined by using X-ray diffraction (XRD). The amorphous forming ability (AFA) of the three alloy systems was discussed based on thermodynamic calculation and experiments. The results show that the Co-Mo thin films exhibit the largest AFA among them, and the Co-W thin films are condition-dependent amorphous while the Co-Cr thin films are hard to be amorphous, which is consistent with the thermodynamic calculation. The difference in AFA for the alloys of these three systems is finally ascribed to three main factors: differences in electronegativity, electron density and atomic size between Co and X elements.

关键词: Amorphous forming ability , Co-Cr , Co-Mo , Co-W

X状Z-pin增强泡沫夹层结构的剪切性能

杜龙 , 矫桂琼 , 黄涛 , 赵龙 , 黄峰

复合材料学报 doi:10.3321/j.issn:1000-3851.2007.06.024

通过不同Z-pin角度(15°和25°)和夹芯厚度(8mm和12.7mm)的X状Z-pin增强泡沫夹层材料的剪切性能试验,与相同材料同尺寸的未增强件进行对比,考察X状Z-pin对泡沫夹层结构的增强作用.试验结果表明,X状Z-pin增强使材料的剪切强度和刚度都有较大幅度的提高;同时,Z-pin的加入使该结构具有与传统泡沫夹层材料不同的剪切破坏形式.在此基础上,结合空间网架结构和等效夹杂方法,提出了X状Z-pin增强泡沫夹层结构剪切刚度模型,计算结果与试验值符合良好.结果表明,X状Z-pin增强不仅能大幅度提高泡沫夹层结构的剪切性能,并具有良好的可设计性,可以通过改变Z-pin角度和材料等改变其力学性能.

关键词: 夹层结构 , Z-pin增强 , 剪切性能

Z125与N234对NR和S-SBR硫化胶增强效果的比较

程俊梅 , 张萍 , 于广水 , 赵树高

宇航材料工艺 doi:10.3969/j.issn.1007-2330.2009.06.016

在比表面积相近的情况下,探讨白炭黑(Z125)及碳黑(N234)对天然橡胶(NR)和溶聚丁苯橡胶(S-SBR)硫化胶的抗割口增长能力及动态力学性能的影响.结果表明,Z125和N234对NR和S-SBR两种硫化胶的增强效果相差不大;NR硫化胶的抗割口增长能力明显好于S-SBR硫化胶;NR中填充Z125的抗割口增长能力好于N234且随疲劳次数的增加Z125的优势更加明显,而S-SBR中填充N234的抗割口增长能力好于Z125且两者的抗割口增长速率基本不随疲劳次数的增加而改变;Z125使NR和S-SBR硫化胶在0℃和70℃下的tanδ值分别低于N234增强相应硫化胶.

关键词: NR , S-SBR , 白炭黑 , 炭黑 , 动态力学性能 , 抗割口增长能力

Thermal transport properties and electronic structure of W-doped rubidium blue bronzes Rb(0.3)Mo(1-x)W(x)O(3) (x=0, 0.001, 0.003, 0.005)

Physica B-Condensed Matter

The thermoelectric power (TEP), electrical resistivity and X-ray photoemission spectrum (XPS) of the W-doped rubidium blue bronzes Rb(0.3)Mo(1-x)W(x)O(3) (x=0, 0.001, 0.003, 0.005) were investigated. It is shown that the Peierls transition is suppressed with the increase in the concentrations of the doped W ions. The sign change of the TEP was observed for all the samples. At low temperature below the Peierls transition, the W-doping makes the obvious decrease in the absolute values of TEP, especially for Rb(0.3)Mo(1-x)W(x)O(3) (x=0.003, 0.005). Furthermore, as compared with the pure blue bronzes, the enlarged difference between Peierls transition temperature (T(p)) and the sign changed temperature (T(s)) in Rb(0.3)Mo(0.999)W(0.001)O(3) bronzes was observed and discussed in detail. (C) 2010 Elsevier B.V. All rights reserved.

关键词: Charge density wave;Blue bronze;Thermoelectric power;Resistivity;charge-density-wave;thermoelectric-power;oxide bronzes;k0.3moo3;transition;scattering;rb0.3moo3;state;impurities;k0.30moo3