Thermal Annealing Effect on Properties of Zn Foils Substrates

Annealing of Zn foils substrates was performed in air for 30 min at 300 oC, 400 oC and 500 oC, respectively. The effects of annealing on the structural and optical properties of Zn foils substrates were investigated using X-ray diffraction (XRD), and photoluminescence (PL) measurements. After annealing, the XRD patterns showed that the annealed ZnO films have c-axis preferential orientation, the crystallinity of the ZnO films was improved, and the grain size decreased by thermal annealing. PL spectra are clearly visible at 376 nm for ZnO film grown on Zn foils substrates. The mean grain size in the annealed ZnO microstructures was estimated using Scherrer’s equation is about 82, 76, 69 nm for 300°C, 400°C, and 500°C, respectively. A PL spectrum is clearly visible at 376 nm for ZnO microstructures grown on Zn foil substrates. The PL analysis indicates that the growth of ZnO thin film with the presence of the defect-related band. Green-yellow band emission is observed at 520 nm.

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Preparation of high-entropy carbides by different sintering techniques

Journal of Materials Science ◽

10.1007/s10853-021-06004-y ◽

2021 ◽

Vol 56 (19) ◽

pp. 11237-11247 ◽

Cited By ~ 1

Author(s):

Johannes Pötschke ◽

Manisha Dahal ◽

Mathias Herrmann ◽

Anne Vornberger ◽

Björn Matthey ◽

...

Keyword(s):

Grain Size ◽

Single Phase ◽

X Ray Diffraction ◽

Vacuum Sintering ◽

X Ray ◽

High Entropy ◽

Mean Grain Size ◽

The Mean ◽

Gas Pressure Sintering ◽

Hardness Values

AbstractDense (Hf, Ta, Nb, Ti, V)C- and (Ta, Nb, Ti, V, W)C-based high-entropy carbides (HEC) were produced by three different sintering techniques: gas pressure sintering/sinter–HIP at 1900 °C and 100 bar Ar, vacuum sintering at 2250 °C and 0.001 bar as well as SPS/FAST at 2000 °C and 60 MPa pressure. The relative density varied from 97.9 to 100%, with SPS producing 100% dense samples with both compositions. Grain size measurements showed that the substitution of Hf with W leads to an increase in the mean grain size of 5–10 times the size of the (Hf, Ta, Nb, Ti, V,)C samples. Vacuum-sintered samples showed uniform grain size distribution regardless of composition. EDS mapping revealed the formation of a solid solution with no intermetallic phases or element clustering. X-ray diffraction analysis showed the structure of mostly single-phase cubic high-entropy carbides. Hardness measurements revealed that (Hf, Ta, Nb, Ti, V)C samples possess higher hardness values than (Ta, Nb, Ti, V, W)C samples.

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Mechanical Properties of Porous Nanophase Materials Measured by Instrumental Indentation

MRS Proceedings ◽

10.1557/proc-400-311 ◽

1995 ◽

Vol 400 ◽

Author(s):

H. Van Swygenhoven ◽

W. Wagner ◽

J. Löffler

Keyword(s):

Mechanical Properties ◽

Grain Size ◽

Annealing Temperature ◽

X Ray Diffraction ◽

X Ray ◽

Gas Condensation ◽

Mean Grain Size ◽

Nanophase Materials ◽

The Mean ◽

Instrumental Indentation

AbstractMechanical properties of nanostructured intermetallic Ni3Al synthesized by the inert-gas condensation technique are studied by means of instrumental indentation using the ICT-CSEMEX indenter. This instrument is a microindenter which continously measures load and displacement. Load-displacement curves are performed as function of grain size, consolidation- and annealing temperature. The mean grain size of the samples are studied by means of x-ray diffraction and small-angle neutron scattering.

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Mudrock Microstructure: A Technique for Distinguishing between Deep-Water Fine-Grained Sediments

Minerals ◽

10.3390/min11060653 ◽

2021 ◽

Vol 11 (6) ◽

pp. 653

Author(s):

Shereef Bankole ◽

Dorrik Stow ◽

Zeinab Smillie ◽

Jim Buckman ◽

Helen Lever

Keyword(s):

Grain Size ◽

Deep Water ◽

Sedimentary Facies ◽

X Ray Diffraction ◽

Weak Current ◽

Large Area ◽

Fine Grained ◽

Mean Size ◽

The Mean ◽

Water Facies

Distinguishing among deep-water sedimentary facies has been a difficult task. This is possibly due to the process continuum in deep water, in which sediments occur in complex associations. The lack of definite sedimentological features among the different facies between hemipelagites and contourites presented a great challenge. In this study, we present detailed mudrock characteristics of the three main deep-water facies based on sedimentological characteristics, laser diffraction granulometry, high-resolution, large area scanning electron microscopy (SEM), and the synchrotron X-ray diffraction technique. Our results show that the deep-water microstructure is mainly process controlled, and that the controlling factor on their grain size is much more complex than previously envisaged. Retarding current velocity, as well as the lower carrying capacity of the current, has an impact on the mean size and sorting for the contourite and turbidite facies, whereas hemipelagite grain size is impacted by the natural heterogeneity of the system caused by bioturbation. Based on the microfabric analysis, there is a disparate pattern observed among the sedimentary facies; turbidites are generally bedding parallel due to strong currents resulting in shear flow, contourites are random to semi-random as they are impacted by a weak current, while hemipelagites are random to oblique since they are impacted by bioturbation.

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The possibility of rapid testing of the mean grain size of rolled metal

Russian Journal of Nondestructive Testing ◽

10.1134/s1061830908010051 ◽

2008 ◽

Vol 44 (1) ◽

pp. 41-44 ◽

Cited By ~ 2

Author(s):

A. V. Kurkov

Keyword(s):

Grain Size ◽

Rapid Testing ◽

Rolled Metal ◽

Mean Grain Size ◽

The Mean

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Fabrication of (SiC-AlN)/ZrB2 Composite with Nano-Micron Hybrid Microstructure via PCS-Derived Ceramics Route

Materials ◽

10.3390/ma14020334 ◽

2021 ◽

Vol 14 (2) ◽

pp. 334

Author(s):

Aidong Xia ◽

Jie Yin ◽

Xiao Chen ◽

Zhengren Huang ◽

Xuejian Liu ◽

...

Keyword(s):

Mechanical Properties ◽

Grain Size ◽

Flexural Strength ◽

Hot Pressing ◽

Raw Materials ◽

Secondary Phase ◽

Pressing Temperature ◽

Xrd Pattern ◽

Mean Grain Size ◽

The Mean

In this work, a (SiC-AlN)/ZrB2 composite with outstanding mechanical properties was prepared by using polymer-derived ceramics (PDCs) and hot-pressing technique. Flexural strength reached up to 460 ± 41 MPa, while AlN and ZrB2 contents were 10 wt%, and 15 wt%, respectively, under a hot-pressing temperature of 2000 °C. XRD pattern-evidenced SiC generated by pyrolysis of polycarbosilane (PCS) was mainly composed by 2H-SiC and 4H-SiC, both belonging to α-SiC. Micron-level ZrB2 secondary phase was observed inside the (SiC-AlN)/ZrB2 composite, while the mean grain size (MGS) of SiC-AlN matrix was approximately 97 nm. This unique nano-micron hybrid microstructure enhanced the mechanical properties. The present investigation provided a feasible tactic for strengthening ceramics from PDCs raw materials.

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The Study on the Fabrication of Nano-Structured Steel by Cold Rolling and Annealing of Martensite

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.634-638.1807 ◽

2013 ◽

Vol 634-638 ◽

pp. 1807-1810

Author(s):

Guang Xu ◽

Jing Yang ◽

Tao Xiong ◽

Peng Deng ◽

Long Fei Cao

Keyword(s):

Grain Size ◽

Cold Rolling ◽

High Strength ◽

Total Elongation ◽

Plain Carbon Steel ◽

Mean Grain Size ◽

Cold Rolling And Annealing ◽

The Mean ◽

Martensite Microstructure ◽

Very High

Sub-nano structured steel was obtained by cold rolling and annealing martensite microstructure for a plain carbon steel. The mean grain size is several hundreds nanometer. The steel has very high strength and also good total elongation.

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Effects of Indium Incorporation on the Optical Properties of ZnO Films

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.11-12.159 ◽

2006 ◽

Vol 11-12 ◽

pp. 159-162 ◽

Cited By ~ 3

Author(s):

Yong Ge Cao ◽

Lei Miao ◽

Sakae Tanemura ◽

Yasuhiko Hayashi ◽

Masaki Tanemura

Keyword(s):

Optical Transmission ◽

Full Width Half Maximum ◽

Structural Disorder ◽

Band Gaps ◽

Zno Films ◽

Photoluminescence Spectra ◽

X Ray Diffraction ◽

X Ray ◽

Optical Band Gaps ◽

Xrd Patterns

Transparent indium-doped ZnO (IZO) films with low In content (<6at%) were fabricated through radio-frequency (rf) helicon magnetron sputtering. Formation of In-Zn-O solid solution was confirmed by X-ray diffraction (XRD) patterns. Incorporation of indium into ZnO films enhances the optical transmission in the visible wavelength. The optical band-gaps slightly increase from 3.25eV (ZnO) to 3.28eV (In0.04Zn0.96O) and to 3.30eV (In0.06Zn0.94O) due to Burstain-Moss effect. The Urbach tail parameter E0, which is believed to be a function of structural disorder, increases from 79meV (ZnO), to 146meV (In0.04Zn0.96O), and to 173meV (In0.06Zn0.94O), which is consistent with increase of Full-Width Half-Maximum (FWHM) in corresponding XRD patterns. Decreasing in crystal quality with increasing indium concentration is also confirmed by photoluminescence spectra.

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Paleolimnology of Lake Yamanaka as reflected on particle-size distribution

Bulletin of the Department of Geology ◽

10.3126/bdg.v14i0.5437 ◽

1970 ◽

Vol 14 ◽

pp. 35-42 ◽

Cited By ~ 1

Author(s):

Danda Pani Adhikari

Keyword(s):

Particle Size ◽

Grain Size ◽

Size Distribution ◽

Central Japan ◽

Size Frequency Distribution ◽

Factors Affecting ◽

Mean Grain Size ◽

The Mean ◽

Main Factors ◽

Lake Size

A 17.63 m long bore-hole core extracted from the deepest part of Lake Yamanaka, one of the Fuji-five Lakes at the northeasternfoot of Mount Fuji, central Japan, composed of sediment with intercalations of scoria fallout deposits. The sediment of the upper11.4 m was investigated for grain-size distribution by using a laser diffraction particle size analyser. The mean grain-size profileshowed various degrees of fluctuations, both short-and long-terms, and the size-frequency distribution revealed unimodal-trimodalmixing of sediments. Changes in lake size and water depth appear to be the main factors affecting the variability in the grain-sizedistribution and properties. The lake level appears low during 7000–5000 cal BP and 2800–1150 cal BP and relatively high during5000–2800 cal BP and 1150 cal BP– present.DOI: http://dx.doi.org/10.3126/bdg.v14i0.5437Bulletin of the Department of Geology Vol.14 2011, pp.35-42

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Microstructure and Mechanical Performance of AZ31-1.7 Wt.% Si Alloy Processed by Cyclic Channel Die Compression

Materials Science Forum ◽

10.4028/www.scientific.net/msf.667-669.457 ◽

2010 ◽

Vol 667-669 ◽

pp. 457-461

Author(s):

Wei Guo ◽

Qu Dong Wang ◽

Man Ping Liu ◽

Tao Peng ◽

Xin Tao Liu ◽

...

Keyword(s):

Mechanical Properties ◽

Grain Size ◽

Tensile Strength ◽

Mechanical Performance ◽

Chinese Script ◽

Cast State ◽

Microstructure And Mechanical Properties ◽

Mean Grain Size ◽

The Matrix ◽

The Mean

Cyclic channel die compression (CCDC) of AZ31-1.7 wt.% Si alloy was performed up to 5 passes at 623 K in order to investigate the microstructure and mechanical properties of compressed alloys. The results show that multi-pass CCDC is very effective to refine the matrix grain and Mg2Si phases. After the alloy is processed for 5 passes, the mean grain size decreases from 300 μm of as-cast to 8 μm. Both dendritic and Chinese script type Mg2Si phases break into small polygonal pieces and distribute uniformly in the matrix. The tensile strength increases prominently from 118 MPa to 216 MPa, whereas the hardness of alloy deformed 5 passes only increase by 8.4% compared with as-cast state.

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