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
MA Zongyi YAO Zhongkai Harbin Institute of Technology
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Harbin
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China
金属学报(英文版)
The SiC_w/Al composite prepared by squeeze casting has a combination of superior room temperature specific strength and modulus together with excellent thermal properties.The extrusion can make an improvement on the strength and ductility of the composite from 582 MPa as squeeze casted up to 639 MPa,and on the transformation from isotropic to the anisotropic structure.This seems to be explained by the orientation of whiskers and the densification of dislocations in matrix.TEM observation indicates that the stacking fault is the usual planar defect on the SiC_w surface. composite;;SiC whisker;;Al alloy;;microstructure
关键词:
composite
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null
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null
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null
ZANG Qishan LIU Kang Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
ChinaKE Wei ZHENG Yuli Institute of Corrosion and Protection of Metals
,
Academia Sinica
,
Shenyang
,
China
金属学报(英文版)
Investigation was carried out of the crack growth rate in weld metal and heat affected zone (HAZ)of offshore structural steels,homemade steel 36Z together with foreign steel A537 of similar strength grade by comparison,in artificial sea water undergone fatigue with different frequencies.The crack growth rate in weld metal and HAZ of steel 36Z fatigued at low fre- queney may be 3—5 and 4—10 times as high as that at high frequency respectivley.The crack growth rate for steel 36Z may fairly match that of A537,The crack growth model and frac- ture of weld metal in corrosive medium were also discussed.
关键词:
weld metal
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null
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null
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null
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null
TIAN Hong-yu
,
CHEN Fu-rong
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XIE Rui-jun
,
et al>
钢铁研究学报(英文版)
Hot-metal ladle is an important part in continuous casting production line and its stress distribution has direct influence on its life. In the process of design and calibration of the large sized hot-metal ladle, it’s of great significance to determine the stress distribution of each part of the ladle for safely and reliably running the device. Based on 100t hot-metal ladle which is designed by Baotou Iron & Steel Group, a simulation of stress field was made by finite element software ANSYS 10.0 in the different dumping angles. Through modeling, loading, restricting and calculating, strain and stress field distribution of the hot-metal ladle were acquired. Finally, an assessment of strength and stiffness was made on the hot-metal ladle. The results show that in the process of tipping for the hot-metal ladle, maximum stress is 137MPa, maximum strain is only 0.681‰, maximum stress and strain have appeared in the stiffener plate which is located at the bottom of the trunnion, and strength and stiffness are qualified. The method which is convenient and practical, reasonable and reliable provides theoretical evidence for checking analysis and further optimal design of the hot-metal ladle.
关键词:
hot-metal ladle;stress field;finite element analysis
孙银洁
,
胡胜泊
,
李秀涛
宇航材料工艺
doi:10.3969/j.issn.1007-2330.2010.02.027
利用SEM、TEM、XPS、XRD、Raman和元素分析仪分析了M40J和T300的表面化学、物理及微观结构特征.研究发现:M40J含碳量高于T300纤维,而含氮量低于T300纤维,且表面活性基团比T300纤维低;M40J和T300碳纤维表面具有大量沟槽,前者相对长而浅,后者相对短而深;T300纤维端面皮芯结构明显,而M40J端面结构较均匀;M40J的微晶结构及取向性优于T300碳纤维.
关键词:
M40J碳纤维
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微观结构
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化学特征
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物理特征
李梦佳
,
陈普会
,
孔斌
,
彭涛
,
姚正兰
,
邱学仕
复合材料学报
doi:10.13801/j.cnki.fhclxb.20150930.002
在关于拉脱载荷下Z-pin增强T型接头的有限元模拟方法基础上,通过对2组蒙皮厚度分别为7.2 mm和4.0 mm的试验件的试验结果进行分析,研究了T型接头蒙皮厚度对 Z-pin增强效果的影响。结果表明：Z-pin增强效果随着蒙皮厚度的减小而增大。蒙皮厚度大于5 mm,Z-pin不能提高结构的最大承载能力,但可显著提高结构首次掉载后的承载性能,使T型接头在较大的加载位移下仍保持较高的承载能力；无论蒙皮厚薄,结构首次掉载后,各Z-pin增强T型接头可达到的载荷平台是相当的,且该载荷平台随蒙皮的变厚有降低的趋势。
关键词:
复合材料
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T型接头
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Z-pin
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蒙皮厚度
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有限元模拟
