Flexural and fracture mechanical properties of in situ particulate reinforced organomineral hybrid resins modified by organofunctional silanes

2019 ◽  
Vol 174 ◽  
pp. 169-175 ◽  
Author(s):  
Mark Kopietz ◽  
Bernd Wetzel ◽  
Klaus Friedrich
Keyword(s):  
Mechanical Properties ◽  
Organofunctional Silanes ◽  
Particulate Reinforced

Refinement of Mg2Si Particulate Reinforced Al-20%Mg2Si In Situ Composite with Addition of Antimony

2014 ◽  
Vol 663 ◽  
pp. 271-275 ◽  
Author(s):  
Nur Azmah Nordin ◽  
Saeed Farahany ◽  
Ali Ourdjini ◽  
Tuty Asma Abu Bakar ◽  
Esah Hamzah
Keyword(s):  
Mechanical Properties ◽  
Growth Temperature ◽  
Microstructural Analysis ◽  
In Situ Composite ◽  
Melt Treatment ◽  
Attractive Candidate ◽  
Result Show ◽  
Particulate Reinforced ◽  
Refinement Effect

Al-Mg2Si in-situ composite have received wider attention due to their improved properties which mark them as attractive candidate to manufacture most of automotive and aerospace components. Result show that the melt treatment of the in-situ composite by addition of antimony caused to refining the morphology of primary Mg2Si reinforcement which would expect to improve the mechanical properties. Effect of Sb on the characteristics parameters of Mg2Si particles have been investigated by thermal and microstructural analysis. The result has revealed that addition of 0.8 wt.% Sb produced optimum refinement effect on the morphology as coarse structure has been changed to polygon one. The result also showed depression with nucleation temperature, TN and growth temperature, TG which also correspond to the refinement effect.

Evaluation of the Effect of Bismuth on Mg2Si Particulate Reinforced in Al-20%Mg2Si In Situ Composite

2013 ◽  
Vol 845 ◽  
pp. 22-26 ◽  
Author(s):  
Nur Azmah Nordin ◽  
Saeed Farahany ◽  
Ali Ourdjini ◽  
T. Abubakar ◽  
Esah Hamzah
Keyword(s):  
Mechanical Properties ◽  
Growth Temperature ◽  
Microstructural Analysis ◽  
Nucleation Temperature ◽  
Potential Candidate ◽  
In Situ Composite ◽  
Melt Treatment ◽  
Particulate Reinforced ◽  
Refinement Effect

Al-Mg2Si in-situ composite as a class of advanced engineering materials has possessed better properties which enhanced them to be potential candidate to manufacture most of automotive and aerospace components. Melt treatment of the in-situ composite by addition of bismuth, Bi has resulted in a change of primary Mg2Si reinforcement to a refined morphology which would expect to improve mechanical properties of the composite. Characteristics parameters of Mg2Si particles have been investigated via thermal and microstructural analysis. It has revealed that 0.4wt.% Bi addition produced optimum refinement effect on the morphology since coarse structure has been change to polygon one and reduced most in size. The result also showed depression in nucleation temperature, TN and growth temperature, TG which also correspond to the refinement effect.

Influence of Cr2O3 Addition on the Properties of TiAl Composites

2011 ◽  
Vol 230-232 ◽  
pp. 789-792
Author(s):  
Jian Feng Zhu ◽  
Wen Wen Yang ◽  
Fang Ni Du
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Flexural Strength ◽  
Synthesis Method ◽  
Strengthening Mechanism ◽  
Reaction Synthesis ◽  
The Matrix ◽  
Method Effects ◽  
Particulate Reinforced

Using Ti, Al and Cr2O3 as starting materials, Al2O3 particulate reinforced TiAl composites have been fabricated by in-situ reaction synthesis method. Effects of the Cr2O3 addition on the microstructures and mechanical properties of the TiAl/Al2O3 composites were investigated in detail. The results show that the composites have a matrix of TiAl, Ti3Al, and minor Cr containing phases, and a second reinforcement Al2O3. The addition of Cr2O3 effectively refined the structure of the matrix, and as a result, the mechanical properties of TiAl composites are improved. At Cr2O3 7.36 wt%, the flexural strength and fracture toughness reach the maximum values of 634.62 MPa and 9.79 MPa·m1/2, which are increased by 80% and 30%, respectively. The strengthening mechanism is also discussed.

Dynamics of Nanoparticle Chain Aggregates of Carbon Under Tension

2003 ◽  
Vol 778 ◽  
Author(s):  
Rajdip Bandyopadhyaya ◽  
Weizhi Rong ◽  
Yong J. Suh ◽  
Sheldon K. Friedlander
Keyword(s):  
Mechanical Properties ◽  
Carbon Black ◽  
Polymer Film ◽  
Elastic Behavior ◽  
Small Strains ◽  
Transmission Electron ◽  
Chain Aggregates ◽  
Nanoparticle Chains ◽  
Reinforcing Filler

AbstractCarbon black in the form of nanoparticle chains is used as a reinforcing filler in elastomers. However, the dynamics of the filler particles under tension and their role in the improvement of the mechanical properties of rubber are not well understood. We have studied experimentally the dynamics of isolated nanoparticle chain aggregates (NCAs) of carbon made by laser ablation, and also that of carbon black embedded in a polymer film. In situ studies of stretching and contraction of such chains in the transmission electron microscope (TEM) were conducted under different maximum values of strain. Stretching causes initially folded NCA to reorganize into a straight, taut configuration. Further stretching leads to either plastic deformation and breakage (at 37.4% strain) or to a partial elastic behavior of the chain at small strains (e.g. 2.3% strain). For all cases the chains were very flexible under tension. Similar reorientation and stretching was observed for carbon black chains embedded in a polymer film. Such flexible and elastic nature of NCAs point towards a possible mechanism of reinforcement of rubber by carbon black fillers.

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