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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

双模晶体相场模型在相结构转变中的研究进展

员江娟 , 陈铮 , 李尚洁

材料导报

双模晶体相场模型是研究复杂晶体结构相变的重要方法.分别介绍了Kuo-An Wu和Greenwood提出的两种双模晶体相场模型,简述了两种模型各自的构造特点:Kuo-An Wu通过在模型中多引入一族倒易矢量来描述复杂晶体结构,Greenwood则通过在自由能函数中引入多峰和构造两点直接相关函数来完成,两者都在模拟三角结构相向正方结构相的转变中得到了广泛应用;进一步指出了Kuo-An Wu模型相转变的影响因素及高斯峰对Green-wood模型相图的影响;最后指明了晶体相场在相变模拟研究中的发展方向.

关键词: 晶体相场模型 , 双模 , 相图 , 相变

Response to the Comment on 'Conjectures on exact solution of three-dimensional (3D) simple orthorhombic Ising lattices'

Philosophical Magazine

The error of Equation (15b) in my article [Z.D. Zhang, Phil. Mag. 87 (2007) p.5309] in the application of the Jordan-Wigner transformation does not affect the validity of the putative exact solution, since the solution is not derived directly from that equation. Other objections of Perk's comment [J.H.H. Perk, Phil. Mag. 89 (2009) p.761] are the same as those in Wu et al.'s comments [F.Y. Wu et al., Phil. Mag. 88 (2008) p.3093; p.3103], which do not stand on solid ground and which I have sought to refute in my previous response [Z.D. Zhang, Phil. Mag. 88 (2008) p.3097]. The conjectured solution can be utilized to understand critical phenomena in various systems, whereas the conjectures are open to rigorous proof.

关键词: 3D Ising model;exact solution;conjecture;critical phenomena;ferromagnetism;magnetic phase transition;model;analyticity

典型编织结构复合材料强度性能的预测

王广海 , 张跃 , 张凡伟 , 刘春俊 , 张大海 , 李仲平

稀有金属材料与工程

以Tsai-Wu强度准则为基础,将三维编织复合材料看作横观各向同性材料,从而对Tsai-Wu强度准则的各阶强度张量系数进行简化,提出了一种计算三维编织复合材料拉伸强度的理论方法.计算了不同编织角和纤维体积分数下,三维四向和正交三向编织复合材料的拉伸强度,并探讨了编织角和纤维体积分数对编织复合材料强度性能的影响,计算结果与实验结果符合较好.

关键词: 三维编织复合材料 , 强度 , Tsai-Wu准则

二氧化铈固体的力学和热物理性质研究

于养信

工程热物理学报

采用基于第一性原理的赝势平面波方法系统地计算了二氧化铈固体基态的晶格结构,体积模量和弹性系数。与实验数据比较表明,Wu—Cohen广义密度梯度近似理论预测出的晶格常数比局部密度近似和Perdew—Wang广义密度梯度近似的更为准确。我们利用Wu—Cohen近似计算出的结构参数和力学常数,确定了Debye温度,并采用Debye模型预测了二氧化铈固体的热膨胀系数和等压热容。与实验数据比较表明,理论预测出的热膨胀系数和热容与实验数据吻合得较好。

关键词: 密度泛函理论 , 弹性系数 , 热膨胀系数 , 热容 , 二氧化铈

固体聚合物的表面张力研究

孙慕瑾 , 笪有仙

玻璃钢/复合材料 doi:10.3969/j.issn.1003-0999.2004.05.002

由倾斜法及静滴法测定了聚合物纤维及板材的浸润临界表面张力.应用S.Wu调和平均法测算其表面能及应用李联欢公式由聚合物本体性能Tg计算其表面能,结果表明测算的结果与实验值基本上一致,说明计算的方法是可行的.

关键词: 临界表面张力 , 固体表面能 , 玻璃转变温度(Tg)

1998 COMPREHENSIVE TABLE OF CONTENTS

中国腐蚀与防护学报

N。1Atmospheric Corrosivlty for Steels………………………………………………… .LIANG Caideng HO[I i。-tat(6)Caustic Stress Corrosion Cr。king of Alloy 800 Part 2.The Effect of Thiosul执e……………………………………… KONG De-sheng YANG Wu ZHAO Guo-zheng HUANG De.ltL。ZHANG Yu。。he CHEN She。g-bac(13)SERS slid E16CttOCh6iniC81 Stlldy Of Illhibit1Oli M6ch&tllsth Of ThlollY68 Oil ITOll ID H....

关键词:

纤维曲线铺放的变刚度复合材料层合板的失效分析

杜宇 , 杨涛 , 李志猛 , 戴维蓉

宇航材料工艺

介绍了一种纤维曲线铺放的变刚度复合材料层合板有限元建模方法.按照曲线铺放规律定义每一个单元的实常数,并对这种纤维曲线铺放层合板进行建模.在此基础上讨论了在弯曲和压缩失效两种不同边界条件下,采用Tsai-Wu失效准则,对其进行失效分析,验证其面内受力情况,计算最大的Tsai-Wu强度比倒数1/R.当1/R =1时,所施加的载荷为失效的临界载荷.对比两组纤维直线和纤维曲线的铺层算例,弯曲失效条件下临界失效载荷提高16%和21%,压缩失效条件下临界失效载荷提高51%和19%.纤维曲线铺放层合板有效提高了失效性能.

关键词: 纤维曲线铺放 , 变刚度复合材料 , 1/R , 失效载荷

天然气井油管悬挂器腐蚀失效分析

刘守平 , 周上祺 , 王佳眉 , 任勤

腐蚀科学与防护技术

用金相显微镜、扫描电镜、X射线衍射仪和X射线能谱仪对天然气井油管悬挂器腐蚀失效进行了检测分析,并对天然气井油管悬挂器用35CrMo钢进行了盐雾试验,结果表明,天然气中的水和CO2是引起腐蚀的主要介质,腐蚀产物主要是FeCO3,高速天然气冲刷和钢中的非金属夹杂加剧了腐蚀的速度. CORROSION FAILURE ANALYSIS OF AN OIL TUBE USED IN NATURAL GAS WELL LIU Shou-ping,ZHOU Shang-qi,WANG Jia-mei,REN Qin Chongqing University A failed oil tube used in natural gas well was examined by optical microscope,scanning electron microscope ,X-ray diffractometer and X-ray spectrometer.Corrosion behavior of 35CrMo steel samples of the oil tube were investigated by means of salt spray tests in the laboratory.The results show that CO2 and H2O are primary factors in the corrosion of oil tube.The corrosion product is FeCO3,non-metallic inclusions in the steel and erosion of natural gas fluid played an important role in accelerating the corrosion. oil tube; natural gas well; 35CrMo steel; failure analysis; corrosion

关键词: 悬挂器 , null , null , null

Response to 'Comment on a recent conjectured solution of the three-dimensional Ising model'

Philosophical Magazine

This is a Response to a recent Comment [F.Y. Wu, B.M. McCoy, M.E. Fisher et al., Phil. Mag. 88 (2008)] on the conjectured solution of the three-dimensional (3D) Ising model [Z.D. Zhang, Phil. Mag. 87 5309 (2007)]. Several points are made: (1) Conjecture 1, regarding the additional rotation, is understood as performing a transformation for smoothing all the crossings of the knots. (2) The weight factors in Conjecture 2 are interpreted as a novel topologic phase. (3) The conjectured solution and its low- and high-temperature expansions are supported by the mathematical theorems for the analytical behavior of the Ising model. The physics behind the extra dimension is also discussed briefly.

关键词: critical temperatures;lattices;analyticity;bounds

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