Jingguo WANG
,
Guoliang CHEN
,
and Zuqing SUN (State Key Lab. for Advanced Metal Materials
,
University of Science and Technology Beijing
,
Beijing
,
100083
,
China)Hengqiang YE (Lab. of Atomic Imaging of Solids
,
Institute of Metal Research
,
Academia Sinica
,
Sh
材料科学技术（英文）
The microstructures and phases of ternary TiAl+Nb alloys containing 50-60 at.-%Al, 0-21 at.-%Nb have been studied using transmission electron microscopy (TEM) and X-ray powder diffraction. The phases present in the alloys and their distribution were found to be a sensitive function of composition. The phase relations between γ-TiAl and γ1 (a new ordered ternary intermetallic compound based on γ-TiAl) were determined. Essentially single γ phase was determined for alloys with relativety low Nb content (≤10 at.-%Nb). the γ1 phase was determined to exist in the composition range containing higher Nb contents (15-21 at.-%Nb). Between γ and γ1 phases, with intermediate Nb contents there is a transitional phase γ1 (a superstructure of γ-TiAl). As for the influence of Al concentration on the phase relations. the γ1 phase was inclined to form in the alloys with relatively high Al contents. The ordering transformation of γ, to γ1 is a continuous ordering process and the transition may be second order.
关键词:
Xiancheng ZHANG
,
Jianming GONG
,
Sh
,
ong TU
材料科学技术（英文）
The thermomechanical behavior and the distribution of residual stresses due to thermal spraying of NiCoCrAlY coating were studied by thermomechanical finite element analysis. The effects of phase transformation due to solidifying process of coating particles, thickness and material properties of coating on the residual stresses were discussed. Results showed that residual stress decreases little with the stress relaxation due to the phase transformation. For the substrates with the same thickness, the residual stress increases with the increase in coating thickness. The state of
residual stresses relates to the material properties of coating and substrate closely. The stress-induced failure model of coating is also discussed.
关键词:
Coating
,
null
,
null
,
null
朱向情
,
陈强
,
庞荣清
,
陈翠竹
,
王强
,
陈佳
,
陈庆华
,
潘兴华
材料导报
doi:10.11896/j.issn.1005-023X.2014.22.012
利用透明质酸钠(Sodium hyaluronate,简称SH)和魔芋葡甘聚糖(Konjac glucomannan,简称KGM)制备共混膜SH/KGM,通过膜的干预减少或阻止硬膜外瘢痕的形成.选择人皮肤成纤维细胞为种子细胞,采用流式细胞术和半定量PCR方法检测细胞的纯度;通过体外移植的方法将成纤维细胞移植到SH/KGM共混膜表面,细胞形态学观察发现细胞由原来的梭形变成不规则的圆形,且细胞能够粘附于SH/KGM共混膜的表面,但移植细胞在移植后的2天、5天和7天内均没有观察到增殖.这种现象表明共混膜SH/KGM具有防止硬膜外瘢痕粘连的作用,可以作为腰椎手术的介入材料.
关键词:
皮肤成纤维细胞
,
透明质酸钠
,
魔芋葡甘聚糖
,
共混膜
,
瘢痕
丁卫撑
,
王义
,
李元景
,
王敏
,
方方
液晶与显示
doi:10.3969/j.issn.1007-2780.2009.06.024
介绍了基于SH1123驱动器的OLED点阵图形显示模块,给出了模块与微处理器C8051F340的硬件接口电路,简要分析了SH1123的指令系统,对C语言编程环境下模块底层驱动程序的实现进行了重点阐述,并给出如何利用按键实现显示菜单控制的方法.
关键词:
微处理器
,
接口
,
驱动程序
,
OLED显示
周红兵
,
吴松林
,
王任甫
,
薛钢
材料开发与应用
采用插销试验和扩散氢试验研究了不同温湿度下的冷却速度、扩散氢含量对SH01焊条冷裂纹敏感性的影响,用扫描电镜观察了插销断口形貌.结果表明,SH01焊条的冷裂纹敏感性较低,其最小临界断裂应力Rcr为830MPa,大于焊条熔敷屈服强度Rp0.2;断口除起裂区具有沿晶和准解理的脆性特征外,其余为韧性的韧窝特征.
关键词:
插销试验
,
扩散氢
,
冷裂纹
,
SH01焊条
史守峡
,
杨庆山
,
刘殿魁
,
齐辉
复合材料学报
doi:10.3321/j.issn:1000-3851.2000.03.024
采用Green函数的方法,研究了介质中同时存在夹杂与裂纹时对SH波的散射,构造了在含有半圆形夹杂的弹性半空间,水平面上任一点承受时间谐和出平面线源载荷作用时的位移函数作为Green函数.并推导了SH波对夹杂与裂纹散射的定解积分方程组,进而求得裂纹尖端的动应力因子.重点讨论了夹杂的存在对裂纹尖端动应力因子的影响,给出了随夹杂介质参数及夹杂与裂纹距离对裂纹尖端动应力因子的分布曲线,为工程设计提供参考依据.
关键词:
SH波
,
夹杂
,
Green函数
,
动应力集中因子
刘启能
,
刘沁
材料导报
利用边界条件推导出SH波在多层介质系统中的转移矩阵,得出了SH波在一维固-固结构声子晶体中的色散函数.利用色散函数研究了SH波在一维固-固结构声子晶体中的全反射隧穿效应,得出SH波的全反射隧穿导带的特征:全反射隧穿导带的频率中心随入射角的增加而向高频方向移动,全反射隧穿导带的频率宽度随入射角的增加而减小；全反射隧穿导带的频率中心和频率宽度都随周期厚度的增加而减小.
关键词:
声子晶体
,
SH波
,
色散
,
全反射
