Novel TiCuNiCo composites with high fracture strength and plasticity

2012 ◽  
Vol 33 ◽  
pp. 226-230 ◽  
Author(s):  
G. Wang ◽  
Y.J. Huang ◽  
J. Shen
Keyword(s):  
Fracture Strength ◽  
High Fracture ◽  
Strength And Plasticity

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.

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.

scholarly journals Microstructures of ZrO2-Al2O3 Composites with High Fracture Strength.

1992 ◽  
Vol 39 (2) ◽  
pp. 92-97
Author(s):  
Ryoichi Shikata ◽  
Taiji Yamamoto ◽  
Takeshi Shiono ◽  
Tomozo Nishikawa
Keyword(s):  
Fracture Strength ◽  
High Fracture

Selective laser melting of nano-TiB 2 decorated AlSi10Mg alloy with high fracture strength and ductility

2017 ◽  
Vol 129 ◽  
pp. 183-193 ◽  
Author(s):  
X.P. Li ◽  
G. Ji ◽  
Z. Chen ◽  
A. Addad ◽  
Y. Wu ◽  
...  
Keyword(s):  
Selective Laser Melting ◽  
Fracture Strength ◽  
Laser Melting ◽  
High Fracture ◽  
Strength And Ductility

scholarly journals Titanium Base Abutments in Implant Prosthodontics: A Literature Review

2021 ◽  
Author(s):  
Ahmad M. Al-Thobity
Keyword(s):  
Dental Implants ◽  
Fracture Strength ◽  
Data Extraction ◽  
Resin Cement ◽  
High Fracture ◽  
Essential Components ◽  
Short Term Evaluation ◽  
Comparable Performance ◽  
Term Evaluation

AbstractImplant abutments are essential components in restoring dental implants. Titanium base abutments were introduced to overcome issues related to existing abutments, such as the unesthetic appearance of titanium abutments and the low fracture strength of ceramic abutments. This study aimed to comprehensively review studies addressing the mechanical and clinical behaviors of titanium base abutments. A search was performed on PubMed/MEDLINE, Web of Science, Google Scholar, and Scopus databases to find articles that were published in English until December 2020 and that addressed the review purpose. A total of 33 articles fulfilled the inclusion criteria and were included for data extraction and review. In vitro studies showed that titanium base abutments had high fracture strength, adequate retention values, particularly with resin cement, and good marginal and internal fit. Although the clinical assessment of titanium base abutments was limited, they showed comparable performance with conventional abutments in short-term evaluation, especially in the anterior and premolar areas. Titanium base abutments can be considered a feasible treatment option for restoring dental implants, but long-term clinical studies are required for a better assessment.

Synthesis of New Ni-Ta-Based Bulk Glassy Alloy with High Fracture Strength of over 3000 MPa

2007 ◽  
pp. 1421-1424
Author(s):  
Wei Zhang ◽  
Kunio Arai ◽  
J. Qiang ◽  
C. Qin ◽  
F. Jia ◽  
...  
Keyword(s):  
Fracture Strength ◽  
Glassy Alloy ◽  
High Fracture ◽  
Bulk Glassy Alloy

Mechanism of High Fracture Strength of Bone

2011 ◽  
Vol 685 ◽  
pp. 379-383
Author(s):  
Bin Chen ◽  
Da Gang Yin ◽  
Quan Yuan ◽  
Ji Luo ◽  
Jing Hong Fan
Keyword(s):  
Electron Microscope ◽  
Fracture Mechanics ◽  
Scanning Electron Microscope ◽  
Fracture Strength ◽  
Nanometer Scale ◽  
High Fracture ◽  
Microstructural Characteristics ◽  
Thin Fiber ◽  
Femur Bone ◽  
Scanning Electron

Scanning electron microscope (SEM) observation showed that femur bone is a kind of bioceramic composite consisting of hydroxyapatite layers and protein matters. The hydroxyapatite layers are further composed of hydroxyapatite fiber sheets. The observation also showed that the hydroxyapatite fiber sheets possess very thin fiber shape. The thickness of the hydroxyapatite fiber sheets is within nanometer scale. The mechanism of the high fracture strength of the bone was investigated based on the microstructural characteristics of the hydroxyapatite fiber sheets and the theory of fracture mechanics. The result reveals that the thin fiber shape of the hydroxyapatite fiber sheets endows the bone with high fracture strength.

scholarly journals Formation and mechanical properties of Cu–Hf–Ti bulk glassy alloys [Article Retracted]

2001 ◽  
Vol 16 (10) ◽  
pp. 2836-2844 ◽  
Author(s):  
Akihisa Inoue ◽  
Wei Zhang ◽  
Tao Zhang ◽  
Kei Kurosaka
Keyword(s):  
Fracture Strength ◽  
Glassy Alloy ◽  
Supercooled Liquid Region ◽  
Maximum Diameter ◽  
Tensile Fracture ◽  
Liquid Region ◽  
High Fracture ◽  
Glassy Alloys ◽  
Plastic Elongation ◽  
Bulk Glassy Alloy

High-strength Cu-based bulk glassy alloys were formed in the Cu–Hf–Ti system by the copper mold casting and melt clamp forging methods. The maximum diameter is 4 mm for the Cu60Hf25Ti15 alloy. The substitution of Hf in the Cu60Hf40 alloy by Ti causes an increase in the glass-forming ability (GFA). As the Ti content increases, the glass transition temperature (Tg) decreases, while the crystallization temperature (Tx) shows a maximum at 5% Ti and then decreases, resulting in a maximum supercooled liquid region ΔTx (= Tx − Tg) of 78 K at 5% Ti. The liquidus temperature (T1) has a minimum of 1172 K around 20% Ti, and hence, a maximum Tg//T1 of 0.62 is obtained at 20% Ti. The high GFA was obtained at the compositions with high Tg/T1. The bulk glassy alloy exhibits tensile fracture strength of 2130 MPa, compressive fracture strength of 2160 MPa, and compressive plastic elongation of 0.8 to 1.6%. The new Cu-based bulk glassy alloys with high Tg/T1 above 0.60, high fracture strength above 2100 MPa, and distinct plastic elongation are encouraging for future development as a new type of bulk glassy alloy that can be used for structural materials.

Sign in / Sign up

Export Citation Format

Share Document