scholarly journals Combustion Synthesis of Large Bulk Nanostructured Ni65Al21Cr14Alloy

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Jiqiang Ma ◽  
Jun Yang ◽  
Qinling Bi ◽  
Licai Fu ◽  
Yonghai Kang ◽  
...  
Keyword(s):  
Combustion Synthesis ◽  
Rapid Solidification ◽  
Compression Test ◽  
Fracture Strength ◽  
High Fracture ◽  
Good Ductility ◽  
Large Bulk ◽  
Density Growth ◽  
20 Nm ◽  
Combustion Synthesis Technique

A large bulk nanostructured Ni65Al21Cr14alloy with dimensions of Φ 100 mm × 6 mm was produced by combustion synthesis technique followed with rapid solidification. The Ni65Al21Cr14alloy was composed of γ′-Ni3Al/γ-Ni(Al, Cr) eutectic matrix and γ-Ni(Al, Cr) dendrite. The eutectic matrix consisted of 80–150 nm cuboidal γ′-Ni3Al and 2–5 nm γ-Ni(Al, Cr) boundary. The dentrite was comprised of high-density growth twins with about 3–20 nm in width. The nanostructured Ni65Al21Cr14alloy exhibited simultaneously high fracture strength of 2200 MPa and good ductility of 26% in compression test.

Bi-combustion synthesis technique for the reduction of crystallite size of nanophosphors - a modified version

2021 ◽  
pp. 1469-1475
Author(s):  
D. S. Kshatri, Shubhra Mishra, Vikas Dubey
Keyword(s):  
Crystallite Size ◽  
Combustion Synthesis ◽  
High Efficiency ◽  
Milling Process ◽  
Synthesis Technique ◽  
Crystallite Sizes ◽  
Average Size ◽  
20 Nm ◽  
Physical And Chemical ◽  
Combustion Synthesis Technique

Nanophase materials, in recent times, have attracted many a researcher all over the world, on account of their exceptionally high efficiency in terms of morphological and optical behavior. In the nano-range order, various physical and chemical methods are employed to produce materials commercially, but the reported methods owing to their own physical conditions, limit the crystallite sizes to a certain nano-order. To prevail over this size-related limitation, a new modified bi-combustion synthesis technique (B-CST) has been introduced, which aids inthe formation of nanomaterials, with an average size of 10-20 nm, without using any ball milling process. In order to scrutinize the crystallite sizes of SrAl2O4: Eu2+, Dy3+ phosphors synthesized by CST and B-CST, the X-ray diffraction (XRD) technique is used to determine the crystalline phase only while high-resolution transmission electron microscopy (HRTEM) is used, which is the most sought-after method world-wide and is vigorously used to determine the crystallite size.

Bulk Metallic Glass Ti42Cu37.1Co4Zr8Sn2Ag2Be4.9 with High Glass Forming Ability and Ductility

2011 ◽  
Vol 217-218 ◽  
pp. 636-641
Author(s):  
Xin Fang Zhang ◽  
Hong Xiang Li ◽  
Zhi Qiang Jiang ◽  
Seong Hoon Yi
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Fracture Strength ◽  
Glass Forming Ability ◽  
Alloy Design ◽  
High Fracture ◽  
Good Ductility ◽  
Glass Forming

Bulk metallic glass Ti42Cu37.1Co4Zr8Sn2Ag2Be4.9 that can be cast into a fully amorphous rod of more than 6 mm in diameter by copper molder casting has been developed through systematic alloy design. The bulk metallic glass exhibits high fracture strength (f＝2071 MPa) and good ductility (f＝5.83％) under compression.

Nanaostructure-Dendrite Ti44Cu46Co4Zr6 Composite with Excellent Mechanical Properties

2012 ◽  
Vol 430-432 ◽  
pp. 369-372
Author(s):  
Xin Fang Zhang ◽  
Xiao Qing Guo ◽  
Chang Yin Gao ◽  
Zhi Qiang Jiang
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Fracture Strength ◽  
Alloy Design ◽  
High Fracture ◽  
Static Compression ◽  
Good Ductility ◽  
Quasi Static Compression

New bulk nanostructure-dendrite Ti44Cu46Co4Zr6composite with excellent mechanical properties has been fabricated by using copper molder casting through systematic alloy design from binary Ti50Cu50. The results showed that the micro-scaledβ-Ti (M) solid solution embedding on the nanostructured matrix, which resulted in the excellent mechanical properties: high fracture strength (σf=2278 MPa) and good ductility (εp=9.01%) under quasi-static compression.

scholarly journals The Microalloying Effect of Ce on the Mechanical Properties of Medium Entropy Bulk Metallic Glass Composites

Crystals ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 483
Author(s):  
Yanchun Zhao ◽  
Pengbiao Zhao ◽  
Wensheng Li ◽  
Shengzhong Kou ◽  
Jianlong Jiang ◽  
...  
Keyword(s):  
Fracture Strength ◽  
Work Hardening ◽  
Magnetic Levitation ◽  
Transition Process ◽  
Martensite Phase ◽  
Mixing Enthalpy ◽  
Size Difference ◽  
Face Centered Cubic ◽  
High Fracture ◽  
Thermally Induced

Novel ultra-strong medium entropy bulk metallic glasses composites (BMGCs) Fe65.4−xCexMn14.3Si9.4Cr10C0.9 and Ti40−xCexNi40Cu20 (x = 0, 1.0), through the martensite transformation induced plasticity (TRIP effect) to enhance both the ductility and work-hardening capability, were fabricated using magnetic levitation melting and copper mold suction via high frequency induction heating. Furthermore, the Ce microalloying effects on microstructure and mechanical behaviors were studied. The Fe-based BMGCs consisted of face-centered cubic (fcc) γ-Fe and body-centered cubic (bcc) α-Fe phase, as well as Ti-based BMGCs containing supercooled B2-Ti (Ni, Cu) and a thermally induced martensite phase B19’-Ti (Ni, Cu). As loading, the TRIP BMGCs exhibited work-hardening behavior, a high fracture strength, and large plasticity, which was attributed to the stress-induced transformation of ε-Fe martensite and B19’-Ti (Ni, Cu) martensite. Ce addition further improved the strengthening and toughening effects of TRIP BMGCs. Adding elemental Ce enhanced the mixing entropy ΔSmix and atomic size difference δ, while reducing the mixing enthalpy ΔHmix, thus improving the glass forming ability and delaying the phase transition process, and hence prolonging the work-hardening period before fracturing. The fracture strength σf and plastic stress εp of Ti39CeNi40Cu20 and Fe64.4CeMn14.3Si9.4Cr10C0.9 alloys were up to 2635 MPa and 13.8%, and 2905 MPa and 30.1%, respectively.

Comparison of Fracture Strength and Fracture Modes of Zirconia Dental Ceramics Manufactured by Four Different CAD/CAM Systems

2011 ◽  
Vol 492 ◽  
pp. 30-34
Author(s):  
Dan Wang ◽  
Yuan Zhi Xu ◽  
Cheng Lin Lu ◽  
Qi Xiang Yang ◽  
Dong Sheng Zhang ◽  
...  
Keyword(s):  
Cyclic Loading ◽  
Critical Load ◽  
Fracture Strength ◽  
Fracture Load ◽  
Image Correlation ◽  
Zirconia Ceramic ◽  
Dental Ceramics ◽  
High Fracture ◽  
Fracture Modes ◽  
Cad Cam

Four sorts of zirconia dental ceramic systems including Cercon smart, Lava, Porcera, and CEREC 3 were studied to analyze fracture mechanism of different CAD/CAM zirconia ceramic. In each system, 12 sectioned specimens were prepared, 6 specimens were taken as controlled group, 6 as experimental group. Quasi-statistic loading before and after cyclic loading was applied at the veneer surface of the specimen. Deformation and crack initiation were monitored with camera in order to carry out digital image correlation (DIC) analysis. The results showed that median cracks were observed under the yielding zone. Specimens fractured along the core/veneer interface with the crack growth. No cone crack was confirmed and fracture only existed in veneer layer. After cyclic loading there were no significant differences for the four ceramic systems in terms of the critical load, while significant differences existed in terms of the fracture load. Both critical load and fracture load were lowered after cyclic loading. After cycling loading, the 4 tested zirconia CAD/CAM ceramic possess high fracture strength to meet the requirement for oral functions. The fracture modes of the four zirconia ceramic systems indicate that the strength of the veneer should be enhanced.

Microstructures and properties of large bulk solidified TiC–TiB2 composites prepared by combustion synthesis under high gravity

2009 ◽  
Vol 61 (3) ◽  
pp. 281-284 ◽  
Author(s):  
Zhongmin Zhao ◽  
Long Zhang ◽  
Yigang Song ◽  
Weiguo Wang ◽  
Hongbo Liu
Keyword(s):  
Combustion Synthesis ◽  
High Gravity ◽  
Large Bulk

Al2O3/ZrO2 (Y2O3) PREPARED BY COMBUSTION SYNTHESIS UNDER HIGH GRAVITY

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1148-1153 ◽  
Author(s):  
LONG ZHANG ◽  
ZHONGMIN ZHAO ◽  
YIGANG SONG ◽  
WEIGUO WANG ◽  
HONGBO LIU
Keyword(s):  
Fracture Toughness ◽  
Flexural Strength ◽  
Combustion Synthesis ◽  
High Fracture Toughness ◽  
High Gravity ◽  
Transformation Toughening ◽  
Composite Ceramics ◽  
Directionally Solidified ◽  
High Fracture ◽  
Toughening Mechanisms

By introducing ZrO 2 (4 Y ) powder into the thermit, Al 2 O 3/ ZrO 2 (4 Y ) composite ceramics of different composition and microstructures were prepared through combustion synthesis under high gravity, and the correlations of composition, microstructures and mechanical properties of composite ceramics were investigated. The results of XRD, SEM and EDS showed that Al 2 O 3/33% ZrO 2 (4 Y ) were composed of random-orientated rod-shaped colonies consisting of a triangular dispersion of orderly submicron-nanometer t - ZrO 2 fibers, surrounded by inter-colony regions consisting of spherically-shaped micronmeter t - ZrO 2 grains; meanwhile, Al 2 O 3/45% ZrO 2 (4 Y ) were comprised of spherically-shaped micron-meter t - ZrO 2 grains. Similar to the international directionally solidified Al 2 O 3/ ZrO 2 ( Y 2 O 3), the EDS results also indicated that there are no impurities, amorphous phases and grain boundaries but clean phase interfaces in two ceramic composites. Compared to the international directionally solidified Al 2 O 3/ ZrO 2 ( Y 2 O 3), the increase in hardness and flexural strength of Al 2 O 3/33% ZrO 2 (4 Y ) in the experiment was due to small-size defect and high fracture toughness induced by compressive residual stress effect and transformation toughening mechanisms; meanwhile, high flexural strength of Al 2 O 3/45% ZrO 2 (4 Y ) was considered to be a result of the fine spherically-shaped t - ZrO 2 grains separated from the melt under high gravity, and high fracture toughness induced by transformation toughening and micro-crack toughening mechanisms.

Enhanced Mechanism of Fracture Toughness in Cannon Bone

2008 ◽  
Vol 368-372 ◽  
pp. 1651-1653
Author(s):  
Bin Chen ◽  
X. Peng ◽  
S. Sun
Keyword(s):  
Fracture Toughness ◽  
Fracture Strength ◽  
Biological Material ◽  
Collagen Matrix ◽  
High Fracture Toughness ◽  
High Fracture ◽  
Sem Observation ◽  
Representative Model ◽  
Parallel Distribution

As a typical biological material, bone possesses high fracture strength and fracture toughness, which are closely related to its exquisite microstructure. SEM observation of a cannon bone shows that the bone is a kind of layered bioceramic composite consisting of hydroxyapatite sheets and collagen matrix. The hydroxyapatite sheets are of long and thin shape, distributing in parallel. The fracture toughness of the bone is analyzed with the representative model of the hydroxyapatite sheets and the concept of maximum pullout energy. It is shown that the lathy shape as well as the parallel distribution of the hydroxyapatite sheets increases the pullout energy and endows the bone with high fracture toughness.

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