Y.N.Wang1)
,
B.L.Wu2)
,
L.Zuo1) and Z.D.Linag1) 1) Department of Materials Science & Engineering
,
Northeastern University
,
Shenyang 110006
,
China 2) Shenyang Institute of Aeronautical Engineering
,
Shenyang 110034
,
China
金属学报(英文版)
Heating rate playsanimportantroleon recrystallizationtextureofcold deformed metals.Inthispaper,thelaser heatingtechnique wasusedtotheultrarapidlyannealingon acold rolledCu 30 mass% Zn alloy. The experimental resultsshow thatthe texture development differs from those observed in the case of conventional annealing. When primary recrystallization completes,the grainsizeisvery fineandthegrain orientation distributionisalmostrandom . Withthecontinuousgrain growing,the dispersioncharacterofthegrainorientationsstillre mains. The possible mechanismson theevolution of ultrarapid recryctallization texture were discussed.
关键词:
Cu 30 mass% Zn alloy
,
null
,
null
Philosophical Magazine
The microstructure of ferroelectric [PbZr(x)Ti(1-x)O(3)/PbZr(y)Ti(1-y)O(3)](n) epitaxial multilayers (x/y 0.2/0.4, 0.4/0.6) deposited on SrRuO(3)-coated SrTiO(3) substrates by pulsed-laser deposition with different layer periodicity and layer thickness was characterized by means of transmission electron microscopy. Electron diffraction and contrast analysis revealed a very clear and well-separated layer sequence. The microstructures of PbZr(0.2)Ti(0.8)O(3)/PbZr(0.4)Ti(0.6)O(3) and PbZr(0.4)Ti(0.6)O(3)/PbZr(0.6)Ti(0.4)O(3) multilayers show a similar tendency in the dependence on the individual layer thickness. Whereas with thick individual layers, tetragonal a-domains are confined to specific layers of the two types of multilayers, below a certain critical thickness of the individual layers, a-domains extend over the whole film. This indicates a transition into a uniform tetragonal lattice and strain state of the whole multilayer. Increasing the layer periodicity further, the interfaces in PbZr(0.4)Ti(0.6)O(3)/PbZr(0.6)Ti(0.4)O(3) multilayers become rough, and complex a-domain configurations appear.
关键词:
ferroelectrics;transmission electron microscopy;microstructure;ferroelectric thin-films;misfit relaxation mechanisms;domain;configurations;heterostructures;polarization
Surface & Coatings Technology
The Ti(Y)N coatings were successfully deposited onto 18-8 stainless steel substrates by the hollow cathode discharge ion-plating method. The influence of the rare-earth element yttrium on the TiN coating properties was studied. The results show that the adhesion of the coating to the substrate were evidently enhanced by adding a small amount (0.2 wt.%) of the rare-earth element yttrium, showing a critical load of about 390 g which is much higher than that (230 g) of the TiN coating/substrate. Investigation on the corrosion resistance of the Ti(Y)N coating and the TiN coating was performed in 0.5 N Na(2)SO(4) + 0.1 N H(2)SO(4) + 0.1 N NaCl corrosion media by means of an electrochemical potentiodynamic polarization. The Ti(Y)N coating exhibited much better corrosion resistance than the TiN coating, whose passivity maintaining current is about one order in magnitude smaller than that of the TiN coating. The Ti(Y)N coatings deposited on some HSS-based tools were presented and compared with the TiN coating. The service lifetime of Ti(Y)N coated tools is approximately 36% higher (on the pinion shape cutters) and about 50% higher (on punch side pin) compared to that of TiN coated. The Ti(Y)N coatings showed such excellent performance. It is attributed to that the transition area of Ti(Y)N/substrate consisted of three sublayers which revealed a gradual change of phase structure and composition, so that the adhesion of the coating/substrate was evidently enhanced. Moreover, Ti(Y)N coating showed a preferred orientation with (111) plane which is favorable to improve wear resistance and corrosion resistance of the coating. (C) 2010 Elsevier B.V. All rights reserved.
关键词:
Ti(Y)N coating;Adhesion;Wear resistance;Corrosion resistance;Phase;structure;Preferred orientation;tin coatings;coated tools;thin-films;deposition;steel;wear;yttrium;alloy;pvd
Solomon Legese Hailu
,
Balachandran Unni Nair
,
Mesfin Redi-Abshiro
,
Isabel Diaz
,
Rathinam Aravindhan
,
Merid Tessema
催化学报
doi:10.1016/S1872-2067(15)61010-5
将Fe(Ⅲ),Ni(Ⅲ)和Cu(Ⅱ)与N,N'-双邻羟苯亚甲基-1,2-苯二胺配位的络合物封装在Y分子筛内,作为多相类Fenton的高级氧化过程的催化剂,用于降解4-氯-3-甲基苯酚(PCMC).采用粉末X射线衍射、热重、N2吸附-脱附、红外光谱、元素分析和扫描电镜对所制催化剂的物化性质进行了表征,并考察了H2O2的初始浓度、催化剂用量、温度和pH值等因素对模型有机污染物降解的影响.结果表明,在Fe(Ⅲ),Ni(Ⅲ)和Cu(Ⅱ)催化剂作用下,在较低的酸性pH值、催化剂用量0.1 g、H2O2的初始浓度0.35 mmol/L的条件下,于50℃反应120 min几乎可以完全去除PCMC.同时还考察了所制PCMC降解催化剂的重复使用性能,提出了可能的催化剂失活机理,也研究了PCMC氧化过程中可能的中间产物和动力学.
关键词:
瓶中造船法
,
4-氯-3-甲基苯酚
,
拟一级反应
,
失活
,
羟基自由基
Applied Physics Letters
The effect of nonmagnetic Y partial substitution at the Dy site in Dy(1-x)Y(x)MnO(3) up to x=0.2 on magnetism, specific heat, and ferroelectricity is investigated, which resulted in a preliminary multiferroic phase diagram. It is revealed that the Y partial substitution suppresses the Dy-spin ordering point (T(Dy)) and ferroelectric ordering point (T(FE)) but enhances the Mn-spin ordering point (T(N)). The interaction between the spins of Dy and Mn is remarkably affected by Y substitution. The measured electrical polarization depends on the Y substitution in a complex way because the ferroelectricity is sensitive to the interaction between the spins of Dy and Mn. (c) 2011 American Institute of Physics. [doi: 10.1063/1.3536506]
关键词:
ferroelectricity;polarization
范永中张淑娟涂金伟孙霞刘芳李明升
金属学报
doi:10.3724/SP.J.1037.2011.00292
分别在未施加偏压和施加-100 V偏压条件下, 利用磁控溅射技术在压气机叶片用 1Cr11Ni2W2MoV热强不锈钢基体上沉积了Ti0.3Al0.7N和Ti0.39Al0.55Si0.05Y0.01N硬质涂层. 实验结果表明, 施加偏压及Si和Y掺杂明显改变了涂层的相结构, 提高了涂层致密度, 施加-100 V偏压且添加Si和Y的涂层为非晶结构, 表面更加均匀致密. 950 ℃氧化实验表明: Ti0.39Al0.55Si0.05Y0.01NN涂层表面形成极薄且致密的 Al2O3保护性氧化膜, 大大降低了氧化速率. 施加-100 V偏压的(Ti, Al)N和(Ti, Al, Si, Y)N沉积态涂层与未施加偏压的相应涂层相比, 硬度均降低, 尤其是(Ti, Al, Si, Y)N涂层变化显著. 经950 ℃热处理, 施加偏压的(Ti, Al, Si, Y)N涂层硬度略有降低, 这是由于形成了硬度较低的B4相, 而未施加偏压的(Ti, Al, Si, Y)N涂层硬度显著提高, 这归因于B1相固溶体的分解. 划痕测试结果表明, 在实验载荷(50 N)下, 所有涂层均未出现连续性的剥落.
关键词:
磁控溅射
,
(Ti, Al)N
,
doping with Si and Y
,
oxidation-resistance
,
hardness
,
adhesion
范永中
,
张淑娟
,
涂金伟
,
孙霞
,
刘芳
,
李明升
金属学报
doi:10.3724/SP.J.1037.2011.00292
分别在未施加偏压和施加-100V偏压条件下,利用磁控溅射技术在压气机叶片用1Cr11Ni2W2MoV热强不锈钢基体上沉积了Ti0.3Al0.7N和Ti0.3gAl0.55Si0.05Y0.01N硬质涂层.实验结果表明,施加偏压及Si和Y掺杂明显改变了涂层的相结构,提高了涂层致密度,施加-100 V偏压且添加Si和Y的涂层为非晶结构,表面更加均匀致密.950℃氧化实验表明:Ti0.39Al0.55Si0.05Y0.01N涂层表面形成极薄且致密的Al2O3保护性氧化膜,大大降低了氧化速率.施加-100 V偏压的(Ti,Al)N和(Ti,Al,Si,Y)N沉积态涂层与未施加偏压的相应涂层相比,硬度均降低,尤其是(Ti,Al,Si,Y)N涂层变化显著.经950℃热处理,施加偏压的(Ti,Al,Si,Y)N涂层硬度略有降低,这是由于形成了硬度较低的B4相,而未施加偏压的(Ti,Al,Si,Y)N涂层硬度显著提高,这归因于Bl相固溶体的分解.划痕测试结果表明,在实验载荷(50 N)下,所有涂层均未出现连续性的剥落.
关键词:
磁控溅射
,
(Ti,Al)N
,
Si和Y掺杂
,
抗氧化性能
,
硬度
,
结合力
王超
,
赵国庆
,
范锦鹏
,
张大海
,
王红洁
宇航材料工艺
doi:10.3969/j.issn.1007-2330.2012.02.021
采用溶胶-凝胶法,利用Al2O3-Y2O3-SiO2溶胶中氧化物与基体中的Si3N4颗粒反应制备一层致密A1-Y-Si-O-N陶瓷涂层.主要研究了烧结温度对陶瓷涂层的组织和性能的影响,利用XRD和EDS分析涂层的相组成和微区元素组成,通过SEM观察涂层的微观形貌.结果显示:在1 400℃烧结时,能够制备出较为致密的陶瓷涂层,涂层由β -siMon,Si2ON,SiO2和非晶相组成；与基体相比,试样的吸水率下降了32.8％～90％,强度提高了2.1％～25.9％.
关键词:
多孔氮化硅
,
陶瓷涂层
,
溶胶-凝胶
,
吸水率
,
弯曲强度
