Single-phase and multiple-phase thermoplastic/thermoset polyblends: 2. Morphologies and mechanical properties of phenoxy/epoxy blends

This review paper concerns the development of the chemical compositions and controlled processes of rolling and cooling steels to increase their mechanical properties and reduce weight and production costs. The paper analyzes the basic differences among high-strength steel (HSS), advanced high-strength steel (AHSS) and ultra-high-strength steel (UHSS) depending on differences in their final microstructural components, chemical composition, alloying elements and strengthening contributions to determine strength and mechanical properties. HSS is characterized by a final single-phase structure with reduced perlite content, while AHSS has a final structure of two-phase to multiphase. UHSS is characterized by a single-phase or multiphase structure. The yield strength of the steels have the following value intervals: HSS, 180–550 MPa; AHSS, 260–900 MPa; UHSS, 600–960 MPa. In addition to strength properties, the ductility of these steel grades is also an important parameter. AHSS steel has the best ductility, followed by HSS and UHSS. Within the HSS steel group, high-strength low-alloy (HSLA) steel represents a special subgroup characterized by the use of microalloying elements for special strength and plastic properties. An important parameter determining the strength properties of these steels is the grain-size diameter of the final structure, which depends on the processing conditions of the previous austenitic structure. The influence of reheating temperatures (TReh) and the holding time at the reheating temperature (tReh) of C–Mn–Nb–V HSLA steel was investigated in detail. Mathematical equations describing changes in the diameter of austenite grain size (dγ), depending on reheating temperature and holding time, were derived by the authors. The coordinates of the point where normal grain growth turned abnormal was determined. These coordinates for testing steel are the reheating conditions TReh = 1060 °C, tReh = 1800 s at the diameter of austenite grain size dγ = 100 μm.

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Mechanical and Thermoelectric Properties of Bulk AlSb Synthesized by Controlled Melting, Pulverizing and Subsequent Vacuum Hot Pressing

Applied Sciences ◽

10.3390/app9081609 ◽

2019 ◽

Vol 9 (8) ◽

pp. 1609 ◽

Cited By ~ 3

Author(s):

A. K. M. Ashiquzzaman Shawon ◽

Soon-Chul Ur

Keyword(s):

Mechanical Properties ◽

Intermetallic Compound ◽

Thermoelectric Properties ◽

Hot Pressing ◽

Single Phase ◽

Aluminum Antimonide ◽

Simple Method ◽

Group Iii ◽

Indirect Band Gap ◽

First Time

Aluminum antimonide is a semiconductor of the Group III-V order. With a wide indirect band gap, AlSb is one of the least discovered of this family of semiconductors. Bulk synthesis of AlSb has been reported on numerous occasions, but obtaining a single phase has always proven to be extremely difficult. This work reports a simple method for the synthesis of single-phase AlSb. Subsequently, consolidation was done into a near single-phase highly dense semiconductor in a form usable for thermoelectric applications. Further, the thermoelectric properties of this system are accounted for the first time. In addition, the mechanical properties of the intermetallic compound are briefly discussed for a possibility of further use.

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Effect of Ferrite Volume Fraction on Mechanical Properties of X80 Pipeline Steel

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.989-994.212 ◽

2014 ◽

Vol 989-994 ◽

pp. 212-215

Author(s):

J. Liu ◽

G. Zhu ◽

W. Mao

Keyword(s):

Mechanical Properties ◽

Heat Treatment ◽

Work Hardening ◽

Single Phase ◽

Volume Fraction ◽

Pipeline Steel ◽

X80 Pipeline Steel ◽

Hardening Behavior ◽

Two Phases ◽

Better Than

The effect of volume fraction of ferrite on the mechanical properties including strength, plasticity and wok hardening was systematically investigated in X80 pipeline steel in order to improve the plasticity. The microstructures with different volume fraction of ferrite and bainite were obtained by heat-treatment processing and the mechanical properties were tested. The work hardening behavior was analyzed by C-J method. The results show that the small amount of ferrite could effectively improve the plasticity. The work hardening ability and the ratio of yield/tensile strength with two phases of ferrite/bainite would be obviously better than that with single phase of bainite. The improvement of plasticity could be attributed to the ferrite in which more plastic deformation was afforded.

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Microstructure Simulation and Toughening Mechanism of Ceramic Tool Material

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.335-336.688 ◽

2011 ◽

Vol 335-336 ◽

pp. 688-694

Author(s):

Xiao Hui Zhu ◽

Chuan Zhen Huang ◽

Han Lian Liu ◽

Bin Zou ◽

Hong Tao Zhu

Keyword(s):

Mechanical Properties ◽

Single Phase ◽

Three Dimensional ◽

Tool Material ◽

Ceramic Tool ◽

Toughening Mechanism ◽

C Language ◽

Finite Element Software ◽

Microstructure Simulation ◽

Ceramic Tool Material

Based on the microstructure results of Monte Carlo simulation, a three-dimensional grid model is built up, and imported into the finite element software with C++ language to analyze the mechanical properties of ceramic tool material. The stress field and residual stress of single-phase and multiphase ceramics have been analyzed by the computer simulation technology.

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The Fabricated Collagen-Based Nano-Hydroxyapatite/β-Tricalcium Phosphate Scaffolds

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.506.57 ◽

2012 ◽

Vol 506 ◽

pp. 57-60 ◽

Cited By ~ 2

Author(s):

M. Ebrahimi ◽

Naruporn Monmaturapoj ◽

S. Suttapreyasri ◽

P. Pripatnanont

Keyword(s):

Mechanical Properties ◽

Solid State ◽

Calcium Phosphate ◽

Biphasic Calcium Phosphate ◽

Single Phase ◽

Physical And Mechanical Properties ◽

Total Porosity ◽

Xrd Pattern ◽

Collagen Coating ◽

Dimensional Shrinkage

The biphasic calcium phosphate (BCP) concept was introduced to overcome disadvantages of single phase biomaterials. In this study, we prepared BCP from nanoHA and β-TCP that were synthesized via a solid state reaction. Three different ratios of pure BCP and collagen-based BCP scaffolds (%HA/%β-TCP; 30/70, 40/60 and 50/50) were produced using a polymeric sponge method. Physical and mechanical properties of all materials and scaffolds were investigated. XRD pattern proved the purity of each HA, β-TCP and BCP. SEM showed overall distribution of macropores (80-200 µm) with appropriate interconnected porosities. Total porosity of pure BCP (93% ± 2) was found to be higher than collagen-based BCP (85%± 3). It was observed that dimensional shrinkage of larger scaffold (39% ± 4) is lower than smaller one (42% ± 5) and scaffolds with higher HA (50%) ratio experienced greater shrinkage than those with higher β-TCP (70%) ratio (45% ±3 and 36% ±1 respectively). Mechanical properties of both groups tend to be very low and collagen coating had no influence on mechanical behavior. Further studies may improve the physical properties of these composite BCP.

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Magnesium-Silicon Substituted Carbonate Hydroxyapatite (Mg-Si CHA): Factors Affecting Sintering

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.694.88 ◽

2016 ◽

Vol 694 ◽

pp. 88-93

Author(s):

Ahmad Fauzi Mohd Noor ◽

Harmiza Zainudin

Keyword(s):

Mechanical Properties ◽

Single Phase ◽

Physical And Mechanical Properties ◽

Major Effect ◽

Carbonate Content ◽

X Ray Diffraction ◽

Factors Affecting ◽

Complex Process ◽

Powder Properties ◽

Properties Of Materials

Sintering has major effect on the final properties of materials such as density, porosity and microstructure. Sintering of Mg-Si CHA in particular is a complex process since changes could occur during sintering, which include phase formation, grain size, pore size and carbonate content, and this in turn affects the mechanical properties. Improved mechanical properties of Mg-Si CHA is critical in load bearing implant applications. Poor control of thermal treatment of Mg-Si CHA during sintering would cause carbonate loss, leading to partial or total decomposition of Mg-Si CHA, subsequently would affect the physical and mechanical properties. The influence of powder properties (particle size, porosity, morphology) and sintering parameters (heating rate, firing atmosphere) on the sintered Mg-Si CHA microstructure was studied using scanning electron microscopy (SEM) characterization technique. The SEM results showed that we are able to produce sintered Mg-Si CHA without cracking of the compacted pellets, while keeping the carbonate level in the amount required (2 – 8%). X-Ray diffraction (XRD) was also performed on the sintered samples and the results indicated that a single phase Mg-Si-CHA was obtained, while Fourier transform infra-red (FTIR) spectroscopy result confirmed that as-synthesized Mg-Si CHA powder was a B-type.

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