Synthesis, Characterization and Mechanical Properties of AA7075 Based MMCs Reinforced with TiB2 Particles Processed Through Ultrasound Assisted In-Situ Casting Technique

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.

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Effect of in-situ processing parameters on microstructure and mechanical properties of TiC particulate reinforced Al–4.5Cu alloy MMC fabricated by stir-casting technique – Optimization using grey based differential evolution algorithm

Measurement ◽

10.1016/j.measurement.2016.07.044 ◽

2016 ◽

Vol 93 ◽

pp. 397-408 ◽

Cited By ~ 11

Author(s):

Biswajit Das ◽

Susmita Roy ◽

R.N. Rai ◽

S.C. Saha ◽

Priyanko Majumder

Keyword(s):

Mechanical Properties ◽

Differential Evolution Algorithm ◽

Processing Parameters ◽

Stir Casting ◽

Casting Technique ◽

Technique Optimization ◽

Evolution Algorithm ◽

In Situ Processing ◽

Particulate Reinforced

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On the preparation and mechanical properties of in situ small-sized TiB2/Al-4.5Cu composites via ultrasound assisted RD method

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2018.06.303 ◽

2018 ◽

Vol 765 ◽

pp. 1008-1017 ◽

Cited By ~ 12

Author(s):

Jun Liu ◽

Zhiwei Liu ◽

Zhiwu Dong ◽

Xiaole Cheng ◽

Qiaoling Zheng ◽

...

Keyword(s):

Mechanical Properties ◽

Ultrasound Assisted

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

10.21203/rs.3.rs-1211378/v1 ◽

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.

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