材料期刊网

THE MAGNETORESISTANT BEHAVIOR OF Ni_(85)Fe_(15) ALLOY FILM IMPLANTED BYCo~+

G.Q. Li , S. Z. Sun , Z. Xianyu , L.H. Sun and D. R. Li Departmentof Physics , Northeastern University , Shenyang 110006 , China

金属学报(英文版)

Implanting 1 ×1016 to1 ×1017 Co+/cm2 into Ni85 Fe15 alloy film anditschangesof mag netoresistantcharacters were researched . The results show that Co+ is very spectacular on modifying Ni85 Fe15 alloyfilm’s magnetoresistancecharacters. Atlower dose,theanisotrop ic magnetoresistivity ratio( AMR) and thesaturated magnetic field didn’tchange almost. ATmedium dose, the saturated magnetic field does not have great change either, butits AMRisraised from 1 % upto 3% . Thisiscomparabletothebest AMRvalueof permalloy based magnetoresistant material prepared by other methods. But the ion implantation tech niqueisrathersimpler. Whentheimplanting doseishigher,its AMRisalsoenhanced notice ably. However,theincreaseof saturated field saysthe material’sstructurecharacters have changed radically.

关键词: anisotropic magnetoresistivityratio , null , null , null

钛等金属的SUN-Z-R复合技术

吴全兴

钛工业进展 doi:10.3969/j.issn.1009-9964.2001.02.008

关键词:

β晶型成核剂改性纤维级聚丙烯Z30S

窦强 , 王斌

高分子材料科学与工程

研究了β晶型成核剂(酰胺化合物)成核改性纤维级聚丙烯Z30S的力学性能,进行了广角X射线衍射和DSC分析.发现成核改性后生成了β晶型聚丙烯,因而聚丙烯Z30S的冲击性能提高.通过纺丝-拉伸实验和对纤维进行广角X射线衍射分析、SEM观察,发现成核改性纤维在纺丝拉伸过程中发生了晶型转变,产生大量微孔隙.

关键词: 聚丙烯 , β晶型 , 成核剂 , 纤维

Z125与N234对NR和S-SBR硫化胶增强效果的比较

程俊梅 , 张萍 , 于广水 , 赵树高

宇航材料工艺 doi:10.3969/j.issn.1007-2330.2009.06.016

在比表面积相近的情况下,探讨白炭黑(Z125)及碳黑(N234)对天然橡胶(NR)和溶聚丁苯橡胶(S-SBR)硫化胶的抗割口增长能力及动态力学性能的影响.结果表明,Z125和N234对NR和S-SBR两种硫化胶的增强效果相差不大;NR硫化胶的抗割口增长能力明显好于S-SBR硫化胶;NR中填充Z125的抗割口增长能力好于N234且随疲劳次数的增加Z125的优势更加明显,而S-SBR中填充N234的抗割口增长能力好于Z125且两者的抗割口增长速率基本不随疲劳次数的增加而改变;Z125使NR和S-SBR硫化胶在0℃和70℃下的tanδ值分别低于N234增强相应硫化胶.

关键词: NR , S-SBR , 白炭黑 , 炭黑 , 动态力学性能 , 抗割口增长能力

高温和应力作用下国产S30432钢中Z相的析出行为

唐波 , 朱丽慧

机械工程材料

利用RD-2型高温持久试验机、高分辨透射电子显微镜和能谱仪研究了国产S30432耐热钢在供货态及不同温度、应力条件下持久断裂后的第二相,尤其是Z相的析出行为及影响因素.结果表明:供货态S30432钢中只存在MX相;在650℃、170 MPa、10 712 h持久条件下析出了M23 C6碳化物和富铜相;在700℃、150MPa、937 h条件下,不仅析出了M23 C6碳化物和富铜相,还出现了Z相及包含MX相和Z相的颗粒;在700℃、150 MPa、1 944 h条件下Z相粗化缓慢,在700℃、100MPa、11 832 h条件下Z相粗化明显;高温和应力均会加速Z相的析出.

关键词: 耐热钢 , Z相 , 显微组织

结构钢S355N及S355N-Z25的低温CTOD断裂韧性及其da/dN研究

陈立志 , 张亚军

材料开发与应用 doi:10.3969/j.issn.1003-1545.2011.05.010

分别采用三点弯曲SE(B)与紧凑拉伸C(T)试样,通过-20℃的低温裂纹尖端张开位移CTOD断裂韧性试验及疲劳裂纹扩展速率da/dN试验,研究了S355N及S355N-Z25结构钢的裂纹启裂与扩展的抗力.研究结果表明:S355N钢抵抗裂纹启裂及前期扩展的能力比S355N-Z25钢强,但前者抵抗裂纹后期扩展的能力比后者弱；当应力强度因子范围,△K小于34.3MPa·√m时,S355N钢的疲劳抗力比S355N-Z25钢弱,当△K等于34.3MPa·√m时,两者具有相同的疲劳抗力,当△K大于34.3MPa·√m时,前者的疲劳抗力比后者强.研究结果对两种钢板在工程上应用及结构的安全评定提供了参考.

关键词: S355N及S355N-Z25钢板 , 低温CTOD断裂韧性 , 疲劳裂纹扩展速率da/dN , 裂纹启裂 , 裂纹扩展 , 抗力

水电站座环用特厚钢板S500Q-Z35焊接性能研究

唐郑磊 , 丁健 , 许少普 , 李忠波 , 杨阳 , 康文举

钢铁研究

根据265 mm厚S500Q-Z35钢板的化学成分,评估冷裂敏感性和再热裂倾向,并对钢板进行Z向窗形层状撕裂试验和T型接头模拟件焊接试验,试验未发现裂纹.按美国ASME标准进行焊接工艺评定,可焊接的最大厚度为350 mm.气体保护焊GMAW和手工焊SMAW焊接后母材组织为粒状贝氏体+索氏体+少量铁素体,热影响区靠近母材区域为索氏体组织,近焊缝区为板条马氏体,并有网状析出物,焊缝区组织为针状铁素体+网状、半网状的先共析铁素体.

关键词: S500Q-Z35 , 焊接 , 裂纹敏感性 , 微观组织

Z-parameter Method for Damage Evaluation in HK40 Steel

Li XING , Jie ZHAO , Fuzhong SHEN , Wei FENG

材料科学技术（英文）

A Z-parameter method is used to evaluate the damage process of HK40 austenitic steel. By using Z-parameter based on the Larson-Miller method, the nonlinear master curve of the log stress vs Larson-Miller parameter P can be expressed as: P=27.74-3.4lgσ-0.032σ, and a family of curves parallel to the master curve can be written as: P=(27.74-Z)-3.4lgσ-0.032σ, where Z represents the magnitude of the deviation from the master curve. According to the creep rupture data both from different segments of a serviced tube and from the same segment locations with different service time, the value of parameter Z has close relationship with the deterioration of creep rupture properties. The damage state of the samples is evaluated by monitoring the changes in natural frequency f and Young0s modulus E, and the relationships between Z and the damage parameters are discussed.

关键词: Damage evaluation , 蠕变断裂 , 奥氏体钢 , Z参数

A Hydrogen Sensor Using SrCe_0:95Yb_0:05O_3-α as Proton Conductor and YH_x+Y H_2-z as Reference Electrode for Determining Hydrogen Pressure in Solid Steel

Ying Liy Changzhen Wang Zhongli Zhang Jiangxin Wang

材料科学技术（英文）

The steel contains a small amount of hydrogen which will escape during the heat treatment. The hydrogen pressure in 16MnRE steel was investigated with a hydrogen sensor, which used SrCe_0:95Yb_0:05O_3-α proton conductor as a solid electrolyte, YH_x+YH_2-z as a solid state reference electrode and Ni wire as electrode constructing a hydrogen concentration cell, shown as Ni|_YH_x+YH_2-z |SrCe_0:95Yb_0:05O_3-α |[H]_steel |Ni. The response time of sensor is less than 10 s. The relational expression of hydrogen partial pressure with temperatures was determined using two shape proton conductors. The results showed the regularity in experimental temperature range, and the hydrogen partial pressure increased as its temperature was raised.

关键词: Hydrogen sensor , Proton conductor , Solid electrolyte

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,由于非零角动量带来的禁戒效应和小的α粒子预形成几率,奇Z超重核的α衰变寿命会明显变长.

关键词: α衰变 , 超重核 , 结团模型