S. W Ma
,
J.C
,
He and H.S. Di 1) School of Materials and Metallurgy
,
Northeastern University
,
Shenyang 110006
,
China 2) The State Key Laboratory of Rolling and Automation
,
Northeastern University
,
Shenyang 110006
,
China
金属学报(英文版)
In this paper three-dimensional flow field in the molten pool between unequal diameter twin rolls has been studied by BFC technology and SIMPLEC numerical method. From the computed flow pattern,the characteristic of molten steel flow has been discussed. The dynamics generated by the feeding flow and the motivation of counter-rotating twin rolls produces a recirculating flow field nearby the small roll due to the larger room and less resistant here and fluid flows along the roll surface tangential nearby large roll and extends to two side dams. There is faintly flow around the dams of molten pool
关键词:
NNSCC
,
null
,
null
,
null
,
null
胡义华
,
刘美希
,
陈丽
,
王小涓
,
储焰南
,
曹德兆
量子电子学报
doi:10.3969/j.issn.1007-5461.2001.04.008
本文在流动余辉装置上,研究了亚稳态He(23S)原子与N2H4分子碰撞传能,观察到了激发态产物NH(A3II→X3∑+)、NH(c1II→a1△)、NH2(A2A1→X2B1)的发射光谱,由相对光谱强度求得了形成各产物的通道比;分析NH(A3II,v＇=0)的转动分辨谱的结果表明,v＇=0能级上的转动布居是"双模”分布,激发态产物NH(A)、NH2(A)的形成机理可能是: He(23S)+N2H4→N2H4*→NH(A)+NH2(A)+H.
关键词:
碰撞传能
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化学发光
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NH(A3Ⅱ)的发射光谱
谢莎
,
邓爱红
,
王康
,
王玲
,
李悦
,
王勇
,
汪渊
材料研究学报
用磁控溅射方法制备纳米多晶钨膜,采用x射线衍射(XRD),扫描电子显微镜(SEM),弹性反冲探测(ERD)和慢正电子束分析(SPBA)等手段研究了在高能He+和H+依次对其辐照后He相关缺陷对H滞留的影响.结果表明,注He+钨膜在退火后从β型钨向α型钨转变；钨膜中的He含量随着退火温度的提高而减少,在873 K退火加剧钨膜中He原子的释放,且造成钨膜空位型缺陷的增加和结构无序度的提高；钨膜中的H滞留总量随着He滞留总量的减少略有下降.
关键词:
金属材料
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磁控溅射钨膜
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慢正电子束分析
,
H
,
He
Zhenya Zhang
材料科学技术（英文）
This study investigated the microstructures and mechanical properties of ZK60 alloy prepared by a simplified rapid solidification powder metallurgy (RS P/M) processing system (S-RS P/M), which consists of warm press in dry air and hot extrusion. Microstructure characterizations showed that S-RS P/M alloy consisted of magnesium matrix and oxide stringers of ~1 μm in width. TEM (transmission electron microscopy) observations illustrated nano-size magnesia particles (10{30 nm) constituted oxide stringer in detail. Due to a relatively higher volume of nano-size magnesia particle produced during S-RS P/M process, 0.2% yield strength of S-RS P/M ZK60 alloy was found to be as high as 382 MPa, which is 10% higher than that of RS P/M alloy. The improvement in mechanical properties is mainly attributed to the combination effects of Orowan mechanism and coe±cient of thermal expansion (CTE) mismatch because of the approximately same average grain size.
关键词:
Microstructure
何鸿
,
韦龙明
,
张寿庭
,
高阳
,
徐毅
黄金
doi:10.3969/j.issn.1001-1277.2009.08.003
八卦庙金矿床石英流体包裹体中3He/4He 值为0.026～0.736 Ra,其中一组为0.026～0.028 Ra,另一组为0.221～0.736 Ra;40Ar/36Ar值为296～1 102;石英包裹体水的H、O同位素组成δD为 - 117.9 ‰～ - 53.38 ‰,δ18OH2O为 - 3.07 ‰～13.30 ‰.He、Ar、H、O同位素比值显示,成矿流体第一阶段印支期为地壳来源,第二阶段燕山期为壳幔混合来源,但地壳来源仍占主要部分.
关键词:
八卦庙金矿床
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成矿流体
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He、Ar、H、O同位素
张建苏
,
袁昌言
腐蚀学报（英文）
1Cr18Ni9Ti在S—Cl—H_2O环境中的腐蚀行为分析张建苏,袁昌言(北京航空材料研究所第五研究室,北京100085)本文以某厂汽提塔再沸器(以下简称E1105)1Cr18Ni9Ti换热管腐蚀故障为例,对其腐蚀现象进行分析.1.E1105换热管腐蚀概况及分析结果换热管内通水蒸汽,管外通石脑油,材料为1Cr18Ni9Ti,其工艺参数为:蒸汽温度246℃,蒸汽压力3.8MPa,气相石脑油温度151℃,气相石脑油压力0.64MPa.人口的石脑油含S量为1.58ppm,含Cl量为3.95ppm,含H。O..
关键词:
王卓
,
刘昌龙
硅酸盐通报
H和He离子联合注入单晶Si可以促使其表面产生发泡、剥落和层离等表面损伤,由此引发了一种有效地制备SOI材料的新方法,即智能剥离技术.文章简述了H和He离子注入单晶Si在随后的热处理过程中引起表面损伤的机理,探讨了注入条件变化对表面损伤的影响,提出了该领域存在的关键问题并介绍了智能剥离技术在现代半导体技术中潜在的应用前景.
关键词:
H和He离子联合注入
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表面损伤
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智能剥离
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单晶Si
丁兆勇
,
孙保民
,
刘远超
,
许秉浩
人工晶体学报
在用热解火焰法合成碳纳米管(carbon nanotubes, CNTs)过程中,CO、H2和He流量对产物种类以及CNTs的产量、结构、管径、管长等有显著影响.为了确定CO、H2和He流量的具体影响,通过固定其他实验条件,仅改变CO、H2和He流量,用扫描电子显微镜(SEM)和高分辨率透射电子显微镜(HR-TEM)对合成的产物进行表征,分析得到合成CNTs较好的CO、H2和He流量分别为0.4 L/min,0.3 L/min和0.2 L/min.
关键词:
碳纳米管
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流量
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热解火焰
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SEM
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TEM
Intermetallics
The well-densified Ni(3)Al alloys without and with boron addition were fabricated by self-propagation high-temperature synthesis and hot extrusion (SHS/HE) technology. Microstructure investigation showed that Ni(3)Al and Ni(3)Al-1B alloys contained fine grain structure. Analysis of X-ray spectra as well as transmission electron microscopy studies revealed that three phases present in all alloys: gamma-Ni, Ni(3)Al and dispersoids of alpha- Al(2)O(3) and gamma- Al(2)O(3). However, beta-NiAl, Ni(3)B phase and twinned Ni(3)Al crystal are observed in the Ni(3)Al-1B alloy. In addition, dislocations with high density exist in all alloys. The mechanical test showed that the B addition leads to obvious improvement in yield strength and compressive ductility, and compared with the ones synthesized by combustion, SHS/HE synthesized Ni(3)Al and Ni(3)Al-1B alloys exhibit more excellent mechanical properties. (C) 2010 Elsevier Ltd. All rights reserved.
关键词:
Nickel aluminides, based on Ni(3)Al;Mechanical properties at ambient;temperature;Reaction synthesis;Microstructure;combustion synthesis;nickel;aluminides;boron
谢波
,
翁葵平
,
侯建平
,
夏修龙
,
李毅
,
古梅
材料导报
doi:10.11896/j.issn.1005-023X.2014.20.030
氢同位素在分子筛上的吸附分离行为是一重要的科学及工程基础问题.针对He/H2/HD与5A分子筛这一体系,综合应用Langmuir-Freundlich吸附等温线方程、空隙填充吸附模型和理想吸附溶液理论,初步描述了He/H2/HD体系在5A分子筛上的吸附分离行为.结果表明:在忽略He吸附的情况下,采用不同方式获得H2/HD体系的吸附等温线虽有差异,但趋势一致;在相同温度下,5A分子筛中每种组分的饱和吸附量是相同的,与组分种类无关;分离因子的计算结果显示,低温循环色谱法分离浓缩H2/D2体系、HD/D2体系和HT/H2体系是完全可行的.
关键词:
吸附
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分离
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分子筛
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氢同位素
