X.P. Tan
材料科学技术（英文）
A conventional X-ray diffractometer has been used to determine the γ/γ´ lattice misfit and γ´ volume fraction for a Ru-containing nickel-based single crystal superalloy at room temperature. The rocking curve was used to characterize the distribution of subgrains. The diffraction peaks obtained by ω-2θ scan were used to determine the γ/γ´ lattice misfit and γ´ volume fraction. A three peaks fitting model was proposed. The peak fitting results are in good agreement with the model. The X-ray diffraction results indicate that the nickel-based single crystal superalloy was not a perfect monocrystalline material, which is comprised of many subgrains; and each subgrain also consists of large numbers of mosaic structures. In addition, two anomalous reflection
phenomena were found during the experiment and discussed with respect to their occurrence and impact on the measurement. The experimental results show that the γ/γ´ lattice misfit and γ´ volume fraction will be various at the different regions of its dendritic microstructure. The average γ/γ´ lattice misfit and γ´ volume fraction of the experimental alloy are approximately -0.2% and 70%, respectively. Furthermore, the γ´ volume fraction calculated by atom microprobe (AP) data is also basically consistent with the experimental results.
关键词:
Nickel-based superalloy
类伟巍
,
沈龙海
,
刘丹
,
李雪飞
,
彭刚
,
崔启良
,
邹广田
无机材料学报
doi:10.3724/SP.J.1077.2007.00400
采用直流电弧法使金属钽和氮气直接反应制备出了TaN纳米粉．利用XRD、XPS、TEM等测试方法对所制备的TaN纳米粉进行了表征．结果表明: 所制备的纳米粉为单一的立方相TaN, 纳米颗粒的平均粒度为5~10nm．实验中还发现氮气的气压对制备纯立方相TaN具有关键性作用, 并讨论了立方相TaN的形成机理．
关键词:
立方相TaN
,
nanocrystallites
,
dc arc discharge method
类伟巍
,
沈龙海
,
刘丹
,
李雪飞
,
彭刚
,
崔启良
,
邹广田
无机材料学报
doi:10.3321/j.issn:1000-324X.2007.03.004
采用直流电弧法使金属钽和氮气直接反应制备出了TaN纳米粉.利用XRD、XPS、TEM等测试方法对所制备的TaN纳米粉进行了表征.结果表明:所制备的纳米粉为单一的立方相TaN,纳米颗粒的平均粒度为5～10nm.实验中还发现氮气的气压对制备纯立方相TaN具有关键性作用,并讨论了立方相TaN的形成机理.
关键词:
立方相TaN
,
纳米粉
,
直流电弧法
Physica Status Solidi a-Applications and Materials Science
In MnAs(1-x)P(x) compounds (x = 0.006 and 0.01), prepared by mechanical alloying, the thermal hysteresis is greatly reduced from about 10-30K in MnAs-based compounds, prepared by conventional melting, to 2K for x = 0.01 (or 4K for x = 0.006). Such obvious hysteretic reduction is ascribed to the grain-size effect, largely due to the preparation method of mechanical alloying. Meanwhile, a maximum value of the magnetic-entropy change Delta S(M) of 11.3 J/kgK for a field change of 2 T is obtained at 294.5K for MnAs(0.994)P(0.006). The study on the MnAs(1-x)P(x) system and also the effect of the preparation technology may be beneficial for the realization of magnetic refrigerants for application at room temperature. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
关键词:
magnetocaloric effect;mechanical alloying;thermal hysteresis;gd-5(si2ge2);transition;mnas
赵海阔
,
雒向东
量子电子学报
doi:10.3969/j.issn.1007-5461.2009.01.018
采用磁控溅射方法在Si(111)基底上沉积不同调制周期的Cu/TaN多层膜,用X射线衍射仪(XRD)与原子力显微镜(AFM)表征薄膜微结构与表面形貌,研究了不同调制周期L薄膜的微结构与表面形貌.结果表明:不同L的TaN调制层均为非晶结构,多晶Cu调制层的晶粒取向组成随着L改变而变化; Cu调制层的表面粗糙度Rrms.大于TaN调制层的Rrms;与Cu单层膜相比,最外层为Cu调制层的Cu/TaN多层膜的Rrms较小;与TaN单层膜相比,最外层为TaN调制层的Cu/TaN多层膜的/Rrms较大;随着L增加,多层膜与对应的单层膜之间的兄Rrms差值逐渐减小.
关键词:
光电子学
,
Cu/TaN
,
多层膜
,
调制周期
,
表面形貌
蒋洪川
,
向阳
,
王超杰
,
莫绍毅
,
雷云
,
张万里
材料导报
采用直流磁控溅射制备TaN薄膜,研究了热处理对TaN薄膜微结构及电性能的影响.结果表明,退火温度及退火时间都将影响薄膜的微结构及方阻.随退火温度的升高和时间的延长,TaN薄膜的方阻逐渐增大,但当退火温度高于800℃时,由于氧化严重导致薄膜的方阻异常增大.退火可显著改善薄膜的TCR,制备态TaN薄膜的TCR值为-1.2X10-3,薄膜经800℃退火30min后,其TCR可降低到-7.0x10-4.
关键词:
TaN薄膜
,
退火
,
微结构
,
方阻
许俊华
,
李戈扬
,
顾明元
无机材料学报
doi:10.3321/j.issn:1000-324X.2000.03.033
用磁控反应溅射的方法在不锈钢基片上制备了NbN/TaN纳米多层薄膜,试验采用X射线衍射仪(XRD)、透射电子显微镜(TEM)及显微硬度仪对薄膜的微结构和硬度进行分析,结果表明:在NbN/TaN多层膜中,NbN层为面心晶体结构,TaN层为六方晶体结构;NbN/TaN纳米多层膜存在超硬效应,在调制周期2.317.0nm这一较宽的范围内保持超高硬度,硬度最大值HK达51.0GPa.
关键词:
NbN/TaN纳米多层膜
,
微结构
,
超硬效应
Y.X.Li
,
G.Z.Xu
,
J.P.Qu
,
F.G.Liu and B.W.Wang Hebei University of Technology
,
Tianjin 300130
,
China C.C.Tang.G.H.Wu and W.S.Zhan State Key Laboratory for Magnetism
,
Institute of Physics
,
CAS
,
Beijing 100080
,
China C.Zhao Tianjin University
,
Tianjin 300072
,
China S.X.Gao Hebei Normal University
,
Shijiazhuang 050091
,
China
金属学报(英文版)
The synthesis and magnetic properties of Pr xCe 1 x Fe 2 have been investigated. The forma tion of Pr xCe 1 x Fe 2 is found to depend strongly on annealing temperature. Pure single phase compound can be synthesized at ambient pressure when x≤0 5. The main phase of the Laves structure can still be observed up to x=0 8. Magnetostriction increases with in creasing x and a largest saturation magnetostriction 200 ppm is observed for x=0.5.
关键词:
magnetostriction
,
null
,
null
