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Structure of the intermetallic compound Ni3Al synthesized under compression of the powder mixture of pure elements Part II: Influence of alloying by boron on the phase composition and the microstructure of grains of the main phase

M. V.Fedorischeva , V.E.Ovcharenko , O.B.Perevalova , E.V.Kozlov

材料科学技术(英文)

The Ni3B phase was formed when boron (0.5 at. pet B) was added to the intermetallic of stoichiometric and off-stoichiometric (Ni-24 at. pct Al) compounds. In the alloy of stoichiometric composition the particles of Ni3B phase has the size around 0.1 mu m and is located on the grain boundary of the main phase. The decreasing of concentrations of Al in the off-stoichiometric alloy leads to increase in the degree of the long-range order parameter, increasing the concentrations of boron in the solid solution and decreasing its localization on the grain boundary. Microalloying of boron leads to increasing in the fraction of grain monodomains with dislocations up to 0.7 in the alloy of the off-stoichiometric composition and up to 1 in the alloy of the stoichiometric composition. It was established the correlation between the degree of the concentration inhomogeneity, average density of the dislocations and the average long range-order parameter.

关键词:

Energy of Grain Boundaries of Different Type in fcc Solid Solutions, Ordered Alloys and Intermetallics with L12 Superstructure

O.B.Perevalova , E.V.Konovalova , N.A.Koneva , E.V.Kozlov

材料科学技术(英文)

The study of the triple junctions of the grain boundaries in some fcc solid solutions, ordered alloys and intermetallics with L12 has been carried out using the optical metallography and TEM methods. Two-types of the triple junctions were found in the alloys investigated (1), consisting of the boundaries of the random (RT), and (2), consisting of the RT boundary and the special boundaries (ST). The relative values of the RT and ST boundary energy were determined on the basis of the measurements of the angles between the grain boundary planes. It has been shown that the energy of ST boundaries increases with the increase of the stacking fault (SF) energy. The energy of the RT boundaries does not depend on the SF energy.

关键词: Alloys , null , null , null

Formation of Nanoscale Intermetallic Phases in Ni Surface Layer at High Intensity Implantation of Al Ions

I.A.Bozhko , S.V.Fortuna , I.A.Kurzina , I.B.Stepanov , E.V.Kozlov , Yu.P.Sharkeev

材料科学技术(英文)

The results of experimental study of nanoscale intermetallic formation in surface layer of a metal target at ion implantation are presented. To increase the thickness of the ion implanted surface layer the high intensive ion implantation is used. Compared with the ordinary ion implantation, the high intensive ion implantation allows a much thicker modified surface layer. Pure polycrystalline nickel was chosen as a target. Nickel samples were irradiated with Al ions on the vacuum-arc ion beam and plasma flow source "Raduga-5". It was shown that at the high intensity ion implantation the fine dispersed particles of Ni3Al, NiAl intermetallic compounds and solid solution Al in Ni are formed in the nickel surface layer of 200 nm and thicker. The formation of phases takes place in complete correspondence with the Ni-Al phase diagram.

关键词: High intensive ion implantation , null , null

14NiCrMo10 6V与Q345E钢过渡匹配焊接接头的组织与力学性能

蒋立明 , 郑华勇 , 许鸿吉 , 谢明

机械工程材料

采用E551T1-Ni2药芯焊丝对Q345E钢与14NiCrMo10 6V钢进行焊接,并通过室温拉伸、弯曲、冲击、硬度试验以及金相分析等对焊接接头的力学性能与显微组织进行了研究。结果表明:采用此焊丝可以获得拉伸、弯曲和冲击性能均良好的焊接接头,焊缝硬度在200~250HV之间;焊缝处晶界组织为先共析铁素体、少量无碳贝氏体(从晶界伸向晶内),晶内为针状铁素体与珠光体,个别部位有粒状贝氏体;Q345E钢侧热影响区与焊缝过渡区的组织为沿晶界析出的块状先共析铁素体和向晶内生长的条状铁素体以及少量的珠光体和贝氏体;14NiCrMo10 6V钢侧热影响区与焊缝过渡区的组织为板条状马氏体。

关键词: Q345E , 14NiCrMo10 , 6V , 焊接接头 , 力学性能

正火温度对Nb-V-Ti微合金化大截面锻材Q345E钢组织与韧性的影响?

文新理 , 梅珍 , 张利冲 , 刘雅政 , 肖磊磊 , 刘广磊

材料导报 doi:10.11896/j.issn.1005-023X.2016.20.021

采用热膨胀法测定了 Nb-V-Ti微合金化 Q345E钢的相变临界温度Ac1和Ac3,使用45 kW箱式电阻炉对实验钢进行了正火处理,利用光学显微镜(OM)、扫描电镜(SEM)、电子背散射衍射(EBSD)和透射电镜(TEM)观察了正火后试样的组织演变规律,分析了正火温度对组织与低温韧性的影响。结果表明,Q345E钢的Ac1约732℃、Ac3约871℃;当正火温度为820℃和850℃时,组织由针状珠光体和未发生重结晶的粗大原始铁素体构成,针状珠光体由针状奥氏体转变而来,相邻针状珠光体中的铁素体相具有相同的晶体取向特征;当正火温度不低于880℃时,组织由重结晶后的铁素体和珠光体构成,随正火温度的提高组织尺寸逐渐增大;当正火温度为820~940℃时,随正火温度的提高冲击功呈现先增加后降低的变化规律,组织类型、尺寸、形态和均匀性是影响大截面锻材 Q345E 低温韧性的主要因素。

关键词: Nb-V-Ti微合金化 , 大截面锻材 , Q345E , 电子背散射衍射 , 韧性

E型环氧树脂的NMR研究

冀克俭 , 刘元俊 , 张银生

高分子材料科学与工程

利用1H-NMR测定了E型环氧树脂的数均分子量,并利用13C-NMR表征了E型环氧树脂的微观结构.

关键词: 环氧树脂 , 核磁共振谱 , 微结构

低能电子碰撞Ar(e, 3e)双电离实验

贾昌春 , A.Lahmam-Bennani , A.Duguet , L.Avaldi , M.Lecas , Dal Cappello

原子核物理评论 doi:10.3969/j.issn.1007-4627.2002.z1.007

通过Ar(e, 3e)五重微分截面3维图的理论与实验比较发现, 在低能电子入射的情况下, 理论与实验存在较大的偏差.

关键词: (e,3e) , 双电离 , 五重微分截面

屏栅电离室+△E-E望远镜探测器系统

王涛峰 , 朱丽萍 , 孟庆华 , 王黎明 , 韩洪银 , 夏海鸿 , 黎光武 , 屈从会 , 顾先宝

原子核物理评论 doi:10.3969/j.issn.1007-4627.2007.03.008

研制了屏栅电离室+△E-E望远镜探测器系统,系统的屏栅电离室用来测定252Cf自发裂变碎片的能量和相对于探测器系统轴线的发射角,与屏栅电离室耦合安装的△E-E望远镜探测器由一个薄的屏栅电离室(气体△E)和一个金硅面垒探测器(E)组成,用来确定互补碎片的电荷.用本系统对252Cf自发裂变碎片电荷分布进行了4个参数的关联测量,结果表明,这个探测器系统的电荷分辨能力Z/△Z好于40:1.

关键词: 屏栅电离室 , E-E望远镜 , 电荷分辨能力

R7E拖车轮E级热处理工艺的研究及应用

张振国 , 刘英 , 邹东红

机械工程材料 doi:10.3969/j.issn.1000-3738.2004.09.010

根据英国BS5892-1992标准中的R7E拖车轮E级热处理要求和力学性能要求,研究了温度、冷却介质、车轮形状等对拖车轮整体力学性能的影响,确定了R7E拖车轮E级热处理工艺为(830士10)℃×(3.5~4)h+(530±10)℃×(3.5~4)h,该工艺可以满足BS5892-1992的要求,按此工艺规程生产的车轮达到了标准中规定的力学性能要求.

关键词: 车轮 , E级热处理 , 力学性能

阴极保护电位对E460钢氢脆敏感性的影响

陈祥曦 , 马力 , 赵程 , 张海兵 , 许立坤

腐蚀与防护 doi:10.11973/fsyfh-201511004

采用慢应变速率试验(SSRT)和电化学方法结合断口扫描电镜观察,研究了阴极保护电位对E460钢在海水中氢脆敏感性的影响.结果表明,随着阴极保护电位负移,E460钢在海水中的氢脆敏感性增加,阴极保护电位为-0.95 V(vs.SCE,下同)时,拉伸试样出现脆性解理断裂特征,电位为-1.05 V时,E460钢断口呈脆性断裂特征.

关键词: 氢脆 , 阴极保护 , 慢应变速率试验(SSRT) , E460钢

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