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Online since: July 2005
Authors: Jeong Min Kim, Ki Tae Kim, Woon Jae Jung, Joong Hwan Jun, Bong Koo Park
A number of alloying elements have been added to Mg-Al alloys to gain better high temperature mechanical properties, however most of them show some drawbacks such as low castability and high cost [1].
SEM-EDS investigations showed that some RE-containing phases were formed adjacent to Mg17Al12 phase at grain boundaries, but Sb-containing phases could not be easily found.
Online since: July 2005
Authors: Ling Yun Wang, Guang Jie Huang, Guang Sheng Huang, Zhong Wei Zhang, Fu Sheng Pan
Each particle contained course equiaxed recrystallized grains, while particle boundaries were almost the same as that of roll compacted green sheets.
Cold rolling and annealing.Though there were some enhancements in strength and plasticity, a number of pores which reduce the mechanical properties still existed in the sintered sheets.
Online since: February 2013
Authors: Zhao Bin Yan, Jun Jun Hu, Shi Hu Kang, Feng Jun Nie
Table1 The type of uranium mineral in Bayanwula area and the result analyzed by EPMA Sampling area Sample number sample position UO2 SiO2 Al2O3 CaO P2O5 FeO TiO2 SO3 Total uranium mineral Bayanwula area 1 BZK311-81 134.5m 61.73 34.68 - - 0.01 0.02 - - 101.06 coffinite 85.04 7.194 1.75 0.16 0.01 - - - 100.97 13 BZK479-16 95m 28.90 14.46 4.64 10.59 17.87 0.94 - - 78.54 Uranium phosphate 10.64 2.06 - 0.77 23.22 0.32 - - 36.81 uranothallite 10.96 2.79 0.59 1.99 28.70 0.43 - -  46.29 14 BZK399-101 122.5m 8.34 12.87 -  1.19 0.466 1.48 1.61 1.61 85.34 6.73 12.44 -  1.58 0.716 1.21 2.01 2.01 82.04 18 BZK391-101 118.9m 14.27 3.26 1.16 8.42 1.84 0.59 2.249 2.249 64.68 isomorphous uranium 15.73 2.46 1.29 7.98 1.27 0.76 2.84 2.84 64.92 Indicate:“-” representative below the detection limit Conclusions Uranium mineralization occur in the middle and lower layer of Saihan formation in Bayanwula area.
The coffinite of the exposed in the main quartz grain voids, uranium thorium along the pyrite, white iron ore on the edge of the distribution,and isomorphous uranium mainly paragenesis with Ce .
Online since: February 2013
Authors: Ding Zhong Tang, Yun Song Zhao, Jian Wei Xu
Experimental procedure The single crystal superalloy bars used in this investigation were cast in the [001] orientation by a spiral grain selector under high temperature gradient and at a controlled withdrawal rate following melting pure master alloy in a vacuum induction melting furnace.
A number of slip systems such as hexahedral slip systems in addition to octahedral slip systems described before have been actived during deformation of DD16 alloys.
Online since: December 2012
Authors: Mohamad Rusop, Nor Diyana Md Sin, Samsiah Ahmad, M.N. Berhan
This phenomenon can be explained by the fact that the number of the sputtered ZnO molecules at the target surface increases due to the enhancement of bombardment by argon ions as the RF power increased [15].
The crystallite sizes were estimated using the Scherer’s formula which is given by [17]: (Scherrer formula) (1) where D is the crystal size or mean grain size, l is the X-ray wavelength, q is the Diffraction angle, and B is the Full Width at Half Maximum (FWHM).
Online since: January 2016
Authors: Koichi Okuda, Hiroyuki Kodama, Tsukasa Inada
Because metallic glass has no grain boundaries and there is a specific slip plane in the crystalline alloy, metallic glass has excellent mechanical properties not found in conventional crystal metals [1-3], including high strength, low Young's modulus, high corrosion resistance and high magnetic resistance.
The results are shown in Figs. 7-9 (circles mean mother number is 40-50, error bars indicate standard deviation).
Online since: October 2007
Authors: Akihisa Inoue, Wei Zhang, Jian Bing Qiang
Improved glass-forming ability (GFA) is thereby a possible consequence of the enhanced stability of ISRO, and a large number of Zr-based bulk metallic glasses (BMGs) with large GFA have been obtained accordingly [3].
Fig. 3 (a) shows the nanometer scaled microstructure with the grain size of about 50 nm.
Online since: June 2008
Authors: Isolda Costa, Hercílio G. De Melo, E.A. Martins, J.L. Rossi
This phase is less noble than the other constituents of the magnet, and is susceptible to preferential corrosive attack when it is exposed to a number of electrolytes.
The secondary electrons image reveals differences in contrast inside some grains showing that some of the phases present variations in composition [6].
Online since: July 2011
Authors: Yong Sheng Liu, Dong Gao
Impact compressive experiments of BFRC Raw material and mix proportion The following raw material were used in the fabrication of the BFRC specimen: ordinary 42.5# Portland cement, coarse aggregate with 5-10mm grain diameter, medium sand with fineness modulus of 2.5, ultrafine and super-short basalt fiber, Water reducing agent, 500 mesh silicon powder, ordinary fly ash and tap water.
Table.2 Experimental results Number Fiber content(%) /MPa ×10-6 /(1/s) Failure mode of specimen AV0S2-01 0.0 68.8 4540 32.0 Broken into pieces AV0S2-02 0.0 66.6 5260 32.3 Broken into pieces AV0S2-03 0.0 72.7 4610 31.2 Broken into pieces AV1S2-01 0.1 77.0 4300 27.1 Crack and do not come loose AV1S2-02 0.1 71.0 4140 27.4 Crack and do not come loose AV1S2-03 0.1 77.8 3850 23.9 Edge crack AV2S2-01 0.2 79.2 4040 24.3 Edge crack AV2S2-02 0.2 67.6 3870 25.0 Edge crack AV2S2-03 0.2 65.8 3960 25.5 Large crack AV4S2-01 0.4 64.8 3520 25.9 Edge crack AV4S2-02 0.4 60.8 3410 22.5 Edge crack AV0S1-04 0.0 58.8 3130 15.3 Fine cracks AV0S1-05 0.0 63.5 3450 17.8 Fine cracks AV0S1-06 0.0 58.1 3450 18.8 Fine cracks AV1S1-04 0.1 63.0 3340 18.6 Fine cracks AV1S1-05 0.1 574 3110 16.3 Fine cracks AV1S1-06 0.1 57.4 2890 15.0 Fine cracks Continue of table 2 AV2S1-04 0.2 62.0 3500 18.6 Fine cracks AV2S1-05 0.2 64.4 3350 18.7 Fine cracks AV2S1-06 0.2 61.1 2780 14.8 Fine cracks AV2S1-04 0.2 51.9 3300 17.8 Fine
Online since: December 2014
Authors: Hui Wang, Ping An Liu, Ling Ke Zeng, Wen Cheng Zhu, Xiao Su Cheng, Qian Ying Liang, Yan Chun Liu
Table 1 Technical indexes of raw materials Raw materials Particle size(nm) Specific surface area(m2/g) TiO2 30 - TiO2 40 - TiO2 50 - TiO2 60 - Ordinary carbon black - 58.664 acetylene carbon black - 138.921 Table 2 Prescription of synthesizing TiC number formula 1 TiO2 (30 nm) Ordinary carbon black 2 TiO2 (40 nm) Ordinary carbon black 3 TiO2 (50 nm) Ordinary carbon black 4 TiO2 (60 nm) Ordinary carbon black 5 TiO2 (30 nm) acetylene carbon black 6 TiO2 (40 nm) acetylene carbon black 7 TiO2 (50 nm) acetylene carbon black 8 TiO2 (60 nm) acetylene carbon black The preparation process Synthesis conditions: nano powders were synthesized viathe continuous synthesis furnace which has the independent intellectual property rights at the synthesis temperature range between 1100℃, 1200℃, 1300℃ and1400℃.
Measurements The purity and the grain size of the synthesized nano powders were characterized by the neo-confucianism D/Max-III full-automatic X diffractometer (Japan), and the neo-confucianism D/Max-1200 tape automatic X-ray diffractometer (Japan), respectively.
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