The effect of in-situ formed TiB2 particles on microstructural and mechanical properties of laser melted copper alloy

2020 ◽  
Vol 111 (2) ◽  
pp. 153-159
Author(s):  
Jelena Stašić ◽  
Dušan Božić
Keyword(s):  
Mechanical Properties ◽  
Copper Alloy ◽  
Tib2 Particles

Microstructure Formation Mechanism of (Al2O3+TiB2+Al3Ti)/Al Composites Fabricated by Reactive Hot Pressing

2007 ◽  
Vol 353-358 ◽  
pp. 1439-1442 ◽  
Author(s):  
Gui Song Wang ◽  
Lin Geng
Keyword(s):  
Mechanical Properties ◽  
Young’S Modulus ◽  
Formation Mechanism ◽  
Hot Pressing ◽  
Young's Modulus ◽  
Microstructure Formation ◽  
Sem And Tem ◽  
Reactive Hot Pressing ◽  
Tib2 Particles

The two (Al2O3+TiB2+Al3Ti)/Al composites were fabricated from Al-B2O3-TiO2 and Al-B-TiO2 raw powders by reactive hot pressing, respectively. The microstructure of in situ two composites was analyzed by OM, SEM and TEM. The results showed that coarse Al3Ti blocks with several tens of micrometers size were formed during hot pressing. The equiaxed Al2O3 particulates and hexagonal TiB2 particulates with finer sizes were formed in the composites simultaneously. The microstructure formation mechanism of (Al2O3+TiB2+Al3Ti)/Al composites were discussed. The results showed that Al2O3 reinforcements were formed on the surface of TiO2 or B2O3 powder and TiB2 particles were formed on B or B2O3 powders. The formation of coarse Al3Ti block is result from continuous diffusion of Ti in liquid Al during reactive hot pressing. In addition, there are fine Al3Ti precipitates exist in the composite fabricated from Al-B-TiO2 powders. This contributes to the improved mechanical properties in terms of yield and ultimate stresses and Young’s modulus of the composite.

scholarly journals New Paradigm On The Mechanical Properties of In-Situ Formed By Al/TiB2 and Al/TiB2/Cu MMCs

2022 ◽  
Author(s):  
Rajaravi C ◽  
Gobalakrishnan B ◽  
AMALA MITHIN MINTHER SINGH A ◽  
ARUL FRANCO P ◽  
SHARUN V
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Tensile Strength ◽  
Metal Matrix ◽  
Xrd Analysis ◽  
New Paradigm ◽  
Casting Method ◽  
Optical Micrograph ◽  
Tib2 Particles

Abstract In the current study, in-situ formed Al/6wt. % TiB2 and Al/6wt. % TiB2/4wt. % Cu Metal Matrix were investigated. Composites were made using the sir casting method, and both composites were compared. The composite is synthesized by combining two precursor salts, Potassium Hexa Fluro Titanate (KBF4) and potassium tetrafluoroborate (K2TiF6), with stoichiometric compositions corresponding to 6 percent by weight of TiB2 particles, with A356 aluminium melt at 820° C, speed 300 rpm, and holding time 30 minutes. Following that, 4wt. % Cu powder was added to the composite melt, which was then poured into the permanent mould. Mechanical properties tests such as tensile strength, hardness, and fracture toughness were carried out in accordance with ASTM guidelines. The mechanical properties of the in-situ formed Al/6wt. % TiB2/4wt. % Cu composite outperform those of the Al/6wt.% TiB2 composite and base metal. Optical micrograph and XRD analysis both confirm the presence of TiB2 and Cu particles.

Effect of in-situ TiB2 particles on microstructure and mechanical properties of Mg2Si/Al composites

2019 ◽  
Vol 776 ◽  
pp. 536-542 ◽  
Author(s):  
Rui Du ◽  
Du Yuan ◽  
Fei Li ◽  
Dongcheng Zhang ◽  
Shusen Wu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Microstructure And Mechanical Properties ◽  
Tib2 Particles

scholarly journals Microstructure and Hardness Characterization behavior of Al-Mg-TiB2 In-Situ Composite

2019 ◽  
Vol 8 (10) ◽  
pp. 461-466
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Matrix Composites ◽  
Grain Refining ◽  
In Situ Composite ◽  
Course Innovation ◽  
Tib2 Particles

The Al-Mg-TiB2 is noteworthy modern Aluminum-based composite material due to its phenomenal mechanical properties. These composites show a solid interface between supports – grid when contrasted with other customary Aluminum composites. A blended salt course system was utilized to plan in-situ Al-Mg-TiB2 composites in the present examination. Al – xTiB2 (x = 0, 2.5, 5, 7.5 wt. percent) Metal-Matrix Composites were produced utilizing K2TiF6 and KBF4 salts utilizing an exothermic procedure at 800°C. The materials have been portrayed utilizing SEM and EDS to affirm that no Al3Ti has been created, which is the benefit of blended salt course innovation. SEM micrographs showed TiB2 particles that are conveyed homogeneously without agglomerations all through the aluminum lattice. Research has additionally been directed to examine the hardness of the amalgam strengthened with TiB2 in-situ composites. The hardness of all the created composites was higher than that of Aluminum combination framework in light of the development of TiB2 which brought about grain refining activity

Mechanical Properties of Al-Si Alloy-Based Composites Reinforced by In Situ TiB2 Particulates

2010 ◽  
Vol 105-106 ◽  
pp. 126-129 ◽  
Author(s):  
Jun Ping Yao ◽  
Sun Zhong ◽  
Lei Zhang ◽  
Huo Ping Zhao
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Base Alloy ◽  
Eutectic Mixture ◽  
Grain Refiner ◽  
Reaction Route ◽  
In Situ Techniques ◽  
Tib2 Particles ◽  
Worn Surface

Al–Si alloy-based composites are widely used in automotive, aerospace and mineral processing industries with improved properties. In situ techniques have been developed to fabricate Al–Si alloy-based composites, which can lead to better adhesion at the interface and hence better mechanical properties. Al–Si alloy reinforced with in situ TiB2 particles was synthesized successfully by using salt reaction route. These in situ composites have shown significant improvement in mechanical properties compared with the base alloy. The wear resistance of the alloy is also significantly improved with the addition of TiB2 particles. The hardness, strength and wear resistance are strengthened with increasing TiB2 content of the composites. TiB2 can act not only as a grain refiner for primary Al but also as a modifier of Si in eutectic mixture. Analysis of the worn surface of Al–Si/TiB2 composites tested under loads of 30 and 110N suggests that ploughing is predominant at lower loads and delamination is predominant at higher loads.

Sign in / Sign up

Export Citation Format

Share Document