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2003-2020 全部
为您找到包含“Materials science”的内容共2230

ZHENG Chunlei,CHEN Cheng,ZHANG Fucheng,YAN Zhigang,DAN Rui

The hydrogen embrittlement characteristics of a Mn-Al bainitic steel for railway crossings were studied by means of the slow strain rate test (SSRT), the delayed fracture test and X-ray diffraction (XRD) analysis. The binding energies and hydrogen diffusion barriers of an iron unit cell were tested separately with Al, Si and H, and were evaluated by the first principle calculation. The results showed that the hydrogen embrittlement decreased greatly with increased Al content. Microstructure examinations indicated that the content of retained austenite increased with increased Al content, which was as irreversible hydrogen traps and was not sensitive to hydrogen embrittlement. It is found that the characteristics of hydrogen embrittlement identified by SSRT and the delayed fracture test were different. From the first principle calculation, the binding energy of the iron lattice containing aluminum decreased less as compared to those of the cell containing silicon, but the diffusion barriers increased significantly.

2011-09-07

Ph.D. Programs Foundation of Ministry of Education of China (No. 200802160005

State Key Laboratory of Metastable Materials Science and Technology, College of Materials Science

#Materials Science#

0评论(0 分享(0)

Liu Weiqiang,Chang Cheng,Yue Ming,Yang Jingshan,Zhang Dongtao,Zhang Jiuxing

Ggrain boundary diffusion technique with DyH3 nanoparticles was applied to fabricate Dy-less sintered Nd-Fe-B permanent magnets with high coercivity. The magnetic properties and microstructure of magnets were systematically studied. The coercivity and remanence of grain boundary diffusion magnet were improved by 60% and reduced by 7% compared with those of the original magnet, respectively. Meanwhile, both the remanence temperature coefficient (α) and the coercivity temperature coefficient (β) of the magnets were improved after diffusion treatment. Investigation shows that Dy is preferentially enriched as (Nd, Dy)2Fe14B phase in the surface region of the Nd2Fe14B matrix grains indicated by the remarkable enhancement of the magneto-crystalline anisotropy field of the magnet. As a result, the magnet diffused with a small amount of Dy nanoparticles possesses enhanced coercivity without sacrificing its magnetization.

2012-12-20

高等学校博士学科点专项科研基金资助课题(20091103120024

College of Materials Science and Engineering, Beijing University of Technology,College of Materials

#Materials Science#

0评论(0 分享(0)

Xin Yunchang,Wang Yannan,Zhou Xiaojun,Wang Maoyin,Feng Bo,Huang Guangjie

A pre-treatment of multi-pass cross compression is employed to refine the grain and modify texture of the as-cast AZ31 Mg alloy to improve the hot rolling capability. The application of cross compression along the rolling direction (RD) and the transverse direction (TD) can generate much higher accumulated strain compared to that by the monotonic directional compression, which greatly contributes to refine the huge grain before hot-rolling. The cross compression along RD and TD also form the texture with c-axis of most grains nearly perpendicular to the thickness reduction direction. The effectively refined grains and the specific texture by pre-treated sample effectively enhance the hot-rolling capability at 400 C. The texture and microstructure evolutions of samples during the hot rolling process are also addressed.

2014-11-21

the Doctoral Program of Higher Education of China (20110191120016

College of Materials Science and Engineering, Chongqing University, Chongqing 400030,College of

#Materials Science#

0评论(0 分享(0)

Liu Weiqiang,Sun Chao,Sun Hao,Yue Ming,Zhang Dongtao,Zhang Jiuxing

Nd-Fe-B permanent magnets with a small amount of Al nano-particles doping were prepared by conventional sintered method. Effect of Al content on magnetic property, corrosion resistance and oxidation properties of the magnets were studied. Investigation shows that the coercivity rises gradually, while the remanence decreases simultaneously with increase of Al doping amount. Further investigation reveals that most Al element enriches mainly into the main phase and some Al element distributes into the Nd-rich phase. The autoclave test results show that the corrosion rate of the magnets decrease with the Al content increases. After oxidation, the maximum energy product losses of the magnets with 0.0 wt. % and 0.2 wt. % Al nano-particles doping are 6.13% and 3.99%, respectively. It is, therefore, Al nano-particles doping are a promising way to enhance the coercivity and corrosion resistance of sintered Nd-Fe-B magnet.

2012-03-09

高等学校博士学科点专项科研基金资助课题(20091103120024

College of Materials Science and Engineering, Beijing University of Technology,College of Materials

#Materials Science#

0评论(0 分享(0)

Mingyang Zhou,Lingbao Ren,Gaofeng Quan,Xinxin Su,Yingbo Zhang,Dongdi Yin,Ying Zeng

The corrosion behavior including the corrosion morphology, corrosion rate, corrosion residual strength, and fracture characteristics of as-extruded AZ80 magnesium alloy sheet in wet H2S atmosphere was investigated by macro-observation, optical microscope, scanning electronic microscope and confocal laser scanning microscope, X-ray diffraction in this work. The results revealed that the corrosion rate gradually decreases with the elapse of exposure time. The corrosion process includes corrosion pits initiate on the surface, get expanded and deeper by layer denudation, and then coalesce and connect together. XRD pattern shows that the corrosion products are mainly composed of Mg(OH)2 and MgSO4o2H2O. The formation of stress concentration and high crack-sensitivity at the bottom of the corrosion pits is the main reason for the drop of the corrosion residual strength and ductility at the early stage of the corrosion process. However, with further increasing exposure time, both of the residual strength and ductility decrease very slowly even reach to a stable state. Besides, the variation of the corrosion residual strength and ductility can be described by the exponential decay function during the whole corrosion test.

2016-09-19

Fundamental Research Funds for the Central Universities (No.2682014BR002

the National Natural Science Foundation of China (No.51401172

School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031,School

#Materials Science#

0评论(0 分享(0)

Xingjun Liu,Lei Huang,Shuiyuan Yang,Yixiong Huang,Jinbin Zhang,Jian Li,Jiahua Zhu,Hengxing Jiang,Cuiping Wang

The phase equilibria of the Ni-Ti-Zr ternary system at 1000 C and 1200 C have been experimentally investigated by back-scattered electron (BSE), electron probe microanalyzer (EPMA) and X-ray diffraction (XRD). In the present study, the established isothermal sections were characterized by a series of binary phases, ternary compounds and solid solutions. The results show that nine three-phase regions and one liquid region at 1000 oC, whereas, four three-phase regions and one liquid region at 1200 oC were experimentally confirmed.

2015-05-05

National Natural Science Foundation of China (Nos. 51031003 and 51171159) and the Ministry of Education of China

Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen

#Materials Science#

0评论(0 分享(0)

MO Zhaojun,FAN Ying,LIN Jing,XU Xuewen,CHEN Jinpeng,TANG Chengchun

Highly pure magnesium borate (Mg2B2O5) nanowires with an average diameter of ~30 nm, an average length of ~15 μm and a high aspect-ratio of ~500 have been synthesized in a large scale via a two-step method. MgBO2(OH) nanowires with high aspect-ratios were firstly prepared via a PVP-assisted hydrothermal technique. Then using the as-prepared MgBO2(OH) nanowires as precursors, single crystalline Mg2B2O5 nanowires were synthesized by post-annealing treatment at relatively low temperature of 700 C. The important effect of conversion process on the morphology of the Mg2B2O5 nanowires was investigated, which indicated that the recrystallization process played an important role in protection of 1D nanostructure. Moreover, the rigid and the toughness of the Mg2B2O5 nanowires reinforced PHA composites had been tremendously improved compared with pure PHA. The results demonstrate the effectiveness of Mg2B2O5 nanowires for reinforcement applications in polymer composites.

2013-03-12

RFDP (NO. 20091317110005)

School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130,School

#Materials Science#

0评论(0 分享(0)

Cuiping Wang,Yelu Xu,Shuiyuan Yang,Hengxing Jiang,Jian Li,Jiahua Zhu,Shuang Yang,Xingjun Liu

The phase equilibria of the Sn-Zn-Sb ternary system at 400 oС and 500 C were experimentally determined by electron probe microanalyzer (EPMA), X-ray diffraction (XRD) and differential scanning calorimetry (DSC). In this study, the ternary compound of (Zn,Sn)Sb is confirmed at 400 C and 500 C. Additionally, a liquid phase region is found at 400 C with composition ranges of 9.09 ~ 12.86 at.% Zn and 31.47 ~ 34.22 at.% Sn, which becomes a prolongation of the main liquid as the temperature is raised to 500 C.

2015-05-04

National Natural Science Foundation of China (Nos. 51031003 and 51171159) and the Ministry of Education of China

Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen

#Materials Science#

0评论(0 分享(0)

Gu Changdong,You Y. H.,Wang X.L.,Tu J.P.

Electrodeposition process of Ni-polytetrafluoroethylene (PTFE) composite coatings is limited to use aqueous plating bath where nonionic/cationic wetting agents usually are necessary to prohibit the hydrophobic PTFE particles being coagulated. This study proposes a novel electrolyte for the depositing Ni-PTFE composite coatings which is formed in a deep eutectic solvent (DES). The DES with a non-aqueous nature allows the PTFE particles well be dispersed in the electrolyte without the additive of any wetting agents. The Ni-PTFE composite coatings are successfully electrodeposited from the proposed DES-based plating bath which is confirmed by the scanning electron microscope and X-ray energy dispersive spectroscope. Deposition mechanism, microstructure, and properties of the composite coatings are investigated. Importantly, it is found that the Ni-3.1wt.% PTFE composite coating shows a hydrophobic behavior with a contact angle of about 121±1 and an enhanced wear resistance than the pure Ni coating due to the incorporation of PTFE.

2012-12-07

Specialized Research Fund for the Doctoral Program of Higher Education of China (20100101120026

National Natural Science Foundation of China (51001089

Department of Materials Science and Engineering, Zhejiang University, HangZhou 310025,Department of

#Materials Science#

0评论(0 分享(0)

Zhang Mingang,Liu Wenfeng,Li Minjie,Zhang Haijie,Chai Yuesheng

A series of Ta/Nd/NdFeB/Nd/Ta films with different thickness of NdFeB and Nd were fabricated by magnetron sputtering system. It was found that the coercivity of films strongly depend on the thickness of NdFeB and Nd. The highest in-plane and perpendicular coercivity are obtained of 21.2 kOe and 19.5 kOe at the thickness of 750 nm of NdFeB. Moreover, the thickness of NdFeB and Nd layer affect the magnetic thermal stability of Ta/Nd/NdFeB/Nd/Ta films are also discussed in this paper. The films show higher magnetic thermal stability than commercial NdFeB magnet.

2014-02-14

Natural Science Foundation of Shanxi Province of China(2008011042-2

High School Doctor Subject Fund of China (201014151110003

College of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan

#Materials Science#

0评论(0 分享(0)