材料期刊网

STRENGTHENING CAST IRON MATRIX BY ALLOYING ELEMENTS WITH POSITIVE AND NEGATIVE SEGREGATION

Z.K. Fan , Y.Q. Wang , S.H. Liangand HS. Huang(School of Materials Science and Engineering , Xi'an University of Technology , Xi'an 710048 , China)(Mechanical Engineering Department , Tsinghua University , Beijing 100084 , China)

金属学报(英文版)

The combinational use of alloying elements with positive and negative segmpation hasbeen shown to be very thective in strengthening the matrix of cast iron. Negativesegmpation alloying elements, Cu and Si, make the inner parts of dendritic austenitesand eutectic cells get good handenability. On the ...

关键词: cast iron , null , null

Ni_xAl_yTi_z添加剂对K4169高温合金铸态晶粒组织的影响

郑建邦 , 丁浩 , 郭益平 , 刘林 , 柳伟 , 李行健

金属学报

选用K4169Fe—Ni基高温合金，研究了向熔体中加入NixAlyTiz金属间化合物对合金冷凝后的晶粒尺寸、枝晶组织等凝固组织特征的影响结果表明，加入微量NixAlyTiz细化剂并控制合金液的均匀化处理过程可显著细化晶粒，将铸件整体晶粒细...

关键词: Fe－Ni , grain refinement , nucleant , dendrite morphology , null

The crossover from parallel shift to fan-shape broadening of the superconducting transition of La(1.44)Nd(0.4)Sr(0.16)CuO(4) films in magnetic fields

Superconductor Science & Technology

In this paper we report the transport properties of c-axis-oriented superconducting La(1.44)Nd(0.4)Sr(0.16)CuO(4) films on LaSrAlO(4) substrates with different thicknesses in various magnetic fields parallel and perpendicular to the c axis of the films. It is found that with decreasing film thicknes...

关键词: high-temperature superconductors;crystal thin-films;flux motion;la2-xsrxcuo4;strain;insulator;dependence;behavior

Large magnetoresistance over an entire region from 5 to 380 K in double helical CoMnSi compound

Journal of Physics D-Applied Physics

A large magnetoresistance (MR) is observed in a double helical CoMnSi compound over the entire temperature region from 5 K to the maximum measuring temperature of 380 K, with the largest MR ratio of -18.3% at 245 K...

关键词: giant magnetoresistance;magnetic-structure;crystal;metals

Pure annihilation type B→K0*±(1430)K(*)(±) decays in the family non-universal Z' model

中国物理C doi:10.1088/1674-1137/40/1/013101

关键词:

K-cor夹层结构制备工艺

段沐枫 , 李宁 , 郑莹莹 , 肖军 , 李勇

宇航材料工艺

K-cor是应用Z-pin增强技术的一种新型高性能结构.本文以NHZP-1树脂为基体研究适合K-cor结构的半固化...

关键词: 复合材料 , 半固化Z-pin , K-cor夹层结构 , 制备工艺 , 力学性能

奇Z超重核的禁戒α衰变

许昌 , 任中洲

原子核物理评论 doi:10.11804/NuclPhysRev.30.03.308

采用密度依赖的结团模型研究了奇Z超重核的禁戒α衰变,α粒子与子核之间的微观核势通过双折叠模型对M3Y核子-核子相互作用势以及α粒子与子核的密度积分给出.α粒子与子核之间的库仑相互作用也通过α粒子与子核的电荷密度积分给出.计算发现,由于非零...

关键词: α衰变 , 超重核 , 结团模型

Z-pin的拔出强度试验研究

王晓旭 , 陈利

材料工程 doi:10.3969/j.issn.1001-4381.2011.11.001

通过单根Z-pin从复合材料层合板中拔出的试验方法,测试了Z-pin的拔出强度,计算了Z-pin的临界埋入深度,并...

关键词: Z-pin , 拔出强度 , 复合材料 , 拔出试验 , 抗拉强度

Z-pin增强CMC层间Ⅰ＋Ⅱ混合型断裂韧性

刘韡 , 矫桂琼 , 张为民

材料科学与工程学报

提出手工预缝纫方法将3K丝束的T300碳纤维引入预成型体,采用CVI工艺在预成型体和缝线处同时渗透SiC基体,制备了Z-pin增强平纹编织C/SiC陶瓷基复合材料。通过三点弯曲...

关键词: 陶瓷基复合材料 , 断裂韧性 , 应变能释放率 , Z-pin

不同Z值β-SiAlON的显微结构与力学性能

董鹏莉 , 张梅 , 郭敏 , 王习东

耐火材料 doi:10.3969/j.issn.1001-1935.2009.01.006

在1773 K、埋Si3N4粉气氛下,以Si、Al和Al2O3(均为分析纯)为原料合成了Z值分别为0.6、1.3、3.0和4.0的β-SiAlON.试验发现:随着所合成β-Si...

关键词: β-SiAlON , 显微结构 , 晶须 , 耐压强度 , 抗折强度