柳永宁
材料组织结构分析,力学性能实验,材料强度与疲劳断裂的综合研究;金属储氢功能材料,碳纳米管储氢材料、镍氢电池等方向的研究
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- 姓名:柳永宁
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学术头衔:
博士生导师
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学科领域:
材料科学基础学科
- 研究兴趣:材料组织结构分析,力学性能实验,材料强度与疲劳断裂的综合研究;金属储氢功能材料,碳纳米管储氢材料、镍氢电池等方向的研究
柳永宁教授,男,1956年4月3日生,九三学社社员,博士生导师。现任西安交通大学材料学院副院长,金属材料强度国家重点实验室副主任。中国机械工程学会高级会员,中国机械工程学会失效分析分会常务委员,金属学会低温钢专业委员会委员。西安纳米学会理事,《工程力学》编委,《理化检验》编委,《纳米技术》编委。1988年赴丹麦奥尔堡大学进修,1994年赴英国牛津大学进修。2002年赴德国马普金属研究所进行客座教授研究。主要从事材料组织结构分析,力学性能实验,材料强度与疲劳断裂的综合研究;金属储氢功能材料,碳纳米管储氢材料、镍氢电池等方向的研究。近几年内,主持完成以及在研项目10余项,其中主持与参加自然科学重点基金2项,主持部委基金4项,校基金2项,企业项目2项。以第一作者的身份在Metallurgical Transaction, Philosophical Magazine等国际国内权威和重要刊物上发表论文60余篇,其中SCI收录27篇,EI收录17篇。申报发明专利6项,获专利授权3项。在国际首先发明了内联式高电位镍氢动力蓄电池专利技术,电池综合技术指标优于国际一些著名大公司的产品,目前正在进行该技术的产业化工作。发明了温控型纳米碳管电弧炉,可以较大批量的生产高质量单壁纳米碳管,碳60以及非晶型碳纳米管。作为第一获奖人,获得1997年西安交通大学科技进步一等奖一项,1999年陕西省教委科技进步二等奖一项,1999年陕西省科技进步三等奖一项。
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柳永宁, Yongning Liu a, *, , Wei Kang a, Jiawen He a, Zuming Zhu b
Materials Science and Engineering A 343(2003)243-250,-0001,():
-1年11月30日
The interfacial shear strength of SiC fiber reinforced aluminum composite has been studied by the fragmentation test of single fiber reinforced model specimens after a number of fatigue cycles. The result shows that apparent stiffness of the testing machine is influenced by cyclic loading, which will affect the calculation of fiber strength by Clough's model. An extracting test in which fragmented fiber was extracted out by dissolving the matrix material in NaOH water solution indicated that the fiber strength did not lose via vacuum hot press treatment. This result contradicts the Clough's model. The experimental result showed that the critical length of the fiber increases a little after a few cycles of fatigue loading and thus, the interfacial shear strength decreases. The reason for this is that the thermal residual stress around the fiber developed during fabrication decreases in cyclic loading.
Fragmentation, Composite materials, Fracture, Fatigue
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【期刊论文】Study on a low-cobalt l0.8Mg0.2Ni3.2Co0.3Al0.3 alloy
柳永宁, Rui Tang∗, Zhaohui Zhang, Liqin Liu, Yongning Liu, Jiewu Zhu, Guang Yu
International Journal of Hydrogen Energy 29(2004)851-858,-0001,():
-1年11月30日
A low-Co Ml0:8Mg0:2Ni3:2Co0:3Al0:3 alloy was prepared and investigated by examining the alloy structure, phase composition, hydrogen absorption/desorption and electrochemical properties. The alloy is composed of Mg-free LaNi5 phase as matrix and Mg-contained LaNi3 phase as secondary phase. The hydrogen storage capacity (1.37wt%) at 298K, discharge capacity (320mA h=g) and cycling stability (where 88% of the initial capacity remained after 300 charge/discharge cycles) of the alloy are as good as those of the commercial MmNi3.55Co0.75Mn0.4Al0.3 alloy. However, the high-rate discharge ability is better than that of the commercial alloy. The Mn-free composition is advantageous to the oxidization-resistant performance of the alloy. The secondary phase is tougher than the matrix, which not only contributes to the high-rate discharge ability, but also improves the fracture ductility and depresses the disintegration during charge/discharge cycle.
Hydrogen storage alloy, PCT curve, Discharge capacity, High-rate discharge ability, Cycling stability
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【期刊论文】Lath martensite in 1.4%C ultra-high carbon steel and its grain size effect
柳永宁, Zhu Jiewu a, c, Xu Yan b, Yongning Liu a, ∗
Materials Science and Engineering A 385(2004)440-444,-0001,():
-1年11月30日
1.4%C ultra high carbon steel (UHCS) was prepared in order to study the substructure of martensite transformation. Because of ultra-fine spherical carbide, the growth of austenite grain, whose average size was 2.5μm, was prohibited. After quenching, there was a great deal of lath martensite. The sub-structure was composed of a large quantity of dislocations and twins. Through calculation, it was determined that twin shear stress increases faster than that of slip due to the reduction of austenite grain sizes. A model based on twin and slip shear stresses has been proposed, which yields critical grain size ranges from 1-4μm. The result is in agreement with measured results.
Martensitic phase transformation, Slip, Twin
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【期刊论文】CRACK ROTATION FACTOR AND DYNAMIC FRACTURE MEASUREMENT
柳永宁, LU YONGNING and SONG XIAOLONG
Engineering Fracture Mechanics Vol. 52, No.6, pp. 1029-1033, 1995,-0001,():
-1年11月30日
A linear relationship between the cross-head displacement S or pendulum displacement in the Charpy test and the crack mouth opening displacement V has been found in the paper for several polymers and a mild steel. The crack opening displacement δ is material and crack-length dependent and it decreases with increasing crack length. Through analysis the dynamic fracture toughness K1d can be measured from the P-S (the load and the cross-head displacement) curve, which is very easy to obtain in static or dynamic tests.
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柳永宁, Rui Tang∗, Liqin Liu, Yongning Liu, Guang Yu
International Journal of Hydrogen Energy 28(2003)815-819,-0001,():
-1年11月30日
A hydrogen storage electrode alloy Ml0.7Mg0.2Ni2.8Co0.6 was obtained by inductive melting of La-rich mischmetal and some other alloy elements such as Mg, Ni and Co. XRD, SEM and EDX analyses indicated that the microstructure of the prepared alloy was composed of LaNi5 phase as matrix and La5Mg2Ni21 as secondary phase. The highest hydrogen absorption concentration is 1.58wt% at 302K through pressure-concentration-temperature (P-C-T) curves measurement. The discharge capacity reaches 380mAh=g, which is 20% higher than that of traditional LaNi5 type alloys. However, the cycle stability needs to be improved further for commercialization. The formation of La5Mg2Ni21 secondary phase is the key factor for the high capacity of the alloy.
Hydrogen storage alloy, Microstructure, P-C-T curve, Discharge capacity
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柳永宁, 赵廷凯, 柳永宁*, 朱杰武
科学通报,2004,49(23):2394~2396,-0001,():
-1年11月30日
采用温控电弧装置,以Co,Ni合金粉末作为催化剂,放电电流为80A,电压为32V,放电时间为5min,研究了不同气氛、压力及温度对制取非晶碳纳米管的影响,确定了优化参数。在环境温度为600℃时,氢气气氛,真空度约为6.6×104Pa,非晶碳纳米管的产量和纯度(质量分数)都分别达到了6.5g/h和80%以上,其管径为7~20nm。
非晶碳纳米管, 温控电弧法, 气氛影响, 压力影响
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【期刊论文】Storage of methane on wet activated carbon: influence of pore size distribution
柳永宁, Yaping Zhou a, Miao Dai b, Li Zhou b, *, Yan Sun b, Wei Su b
Letters to the Editor/Carbon 42(2004)1852-1855,-0001,():
-1年11月30日
A., Activated carbon, B., High pressure, C., Adsorption, D., Gas storage
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柳永宁, Rui Tang∗, Yongning LiuState
International Journal of Hydrogen Energy 27(2002)1057-1062,-0001,():
-1年11月30日
In this paper a new type of hydrogen storage alloy Ml(NiCoMgAl)5:1−xZnx (06x60:3) was obtained by vacuuminductive melting of La-rich mixed mischmetal elements with Ni and some other alloy elements such as Co, Mg, Al and Zn. The pressure-composition-temperature (P-C-T) tests show that the highest hydrogen concentration can reach 1:58wt% for Zn-free (x=0) composition and then decreases from 1:44wt% (x=0:2) to 1:19wt% (x=0:3), respectively, with the increase of Zn in the alloys. The electrochemical tests show that the electrochemical capacity of alloys reaches a very high level, 380mAh=g for x=0, and then decreases to 366mAh=g (x=0:1); 345mAh=g (x=0:2) and 271mAh=g (x=0:3), respectively, with the increase of Zn in the alloys. The attenuation rate of capacity decreases from16% (x=0) to 4% (x=0:3) after 100 charging=discharging cycles. Proper Zn content (0<x<0:2) in: uences the electrochemical capacity of alloys a little, but it improves the cycle stability and the discharge ability, especially the high rate discharge ability. Optic microscopy, SEM and EDX analyses indicate that the main part of alloys are Mg-free and Mg-contained LaNi5-based solid solutions. The latter is the key to the high electrochemical capacity. The addition of Zn makes the secondary phase change from LaNi2 to Co-rich phase in the alloys and also in: uences their quantity and shape.
Hydrogen storage alloy, P-C-T curve, Discharge capacity, High rate discharge ability, Cycle stability
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