Feng Yang
,
Wenhuai Tian
,
Chuanchao Feng
,
Baosheng Wang
金属学报(英文版)
doi:10.1016/S1006-7191(08)60112-X
Two types of electroformed nickel liners of shaped charges were prepared by electroforming technique. X-ray diffraction (XRD), transmission electron microscopy (TEM), electron backscattering diffraction (EBSD) technique and high resolution electron microscopy (HREM) have been employed to investigate the crystal defects formed in electroformed nickel liners of shaped charges. The result shows that (100) fiber texture which is parallel to the grown direction exists in the electroformed nickel prepared by using direct current electroforming without any additives, and (111) fiber texture exists in the electroformed nickel prepared by using direct current electroforming with additives. The deposits prepared by using direct current electroforming possess columnar grain with an average grain size of 30 μm in width and 170 μm in length. The deposits prepared with additives are composed of a colony structures with grain size of about 29 nm, and a lot of crystal defects such as twins, antiphase boundaries and stacking faults have been observed in the electroformed nickel.
关键词:
Electroformation
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null
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null
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null
,
null
Y.H.Zhu
,
W.B.Lee
,
S.To
材料科学技术（英文）
The nanostructural evolution and phase transformation of the films of a Zn-Al based alloy (Zn¬68Al¬10Cu¬22 in wt pct) have been studied by using X-ray diffraction and scanning electron microscopy. Nanostructural thin films of the Zn-Al based alloy were produced by using an electron beam deposition technique. It was found that a nanocrystalline phase ηn' had a strong preferred crystal orientation at (0002) crystal planes in the as-deposited films. During ageing at 220℃, the decomposition of nanophase ηn' started with clustering to form Z-zones, and transitional phase, which was accompanied by an eutectoid decomposition of the ηn' phase: ηn' →βeut'+T'. Decomposition, such as clustering and the formation of the Z-zones, and the transitional phase etc. were observed in the nanophaseβeut'. The formation and the decomposition of the transitional phase of micrometers in size were involved in the decomposition of the main nanophase ηn'. The mechanism of the Z-zones formation and the stability of nanophases were discussed.
关键词:
Ageing
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null
,
null
,
null
李菊霞
,
戴卫理
,
闫俊青
,
武光军
,
李兰冬
,
关乃佳#
催化学报
doi:10.1016/S1872-2067(14)60215-1
以聚乙烯醇(PEG)为结构导向剂,利用水热法合成了形貌可控的Ta2O5纳米柱.采用X射线衍射、扫描电镜、透射电镜、漫反射紫外-可见光谱和光致发光光谱对所制备样品进行了表征.考察了结晶时间和Ta2O5/Sr(OH)2摩尔比等合成参数对样品形貌的影响,并在此基础上对Ta2O5纳米粒可能的生长机理进行了推测.结果表明,在PEG和Sr(OH)2存在条件下可以合成形貌可控的Ta2O5纳米柱.研究了紫外光下Ta2O5纳米柱降解罗丹明B的光催化性能,发现Ta2O5的形貌对光催化性能有很大影响, Ta2O5纳米柱的光催化性能与其长度和直径比成线性关系.催化降解反应的表观速率常数最高可达0.156 min–1,且经多次循环使用后,样品仍然保持较高的催化性能.
关键词:
五氧化二钽
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纳米结构
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晶体生长
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光催化性质
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各向异性生长
