Fabrication of TiB₂ nanoparticulates-reinforced aluminum matrix composites by powder metallurgy route

Abstract

Al/TiB2 nanocomposites were fabricated via powder metallurgy route through a primarily cold isostatic pressing of aluminum powder containing 1.5, 2.5, 3.5, 5, and 10 Vol.% of TiB2 nanoparticles and subsequent sintering at two temperatures of 650℃ and 680℃. Density, phase analysis, microstructure, and compressive strength of the samples were then characterized. Results indicated that with increasing the content of the second phase (TiB2), the amount of structural deteriorations like porosity and crack increases as a result of poorer distribution of ceramic nanoparticles, agglomeration, and retarded sintering. However, the compressive strength of nanocomposites tends to enhance with addition and increasing the amount of reinforcement phase (TiB2). Improvement in the compressive strength of composites is a result of activation of strengthening mechanisms such as formation and pile-up of dislocations. The trend of the compressive strength decreases after reaching a maximum amount for Al-2.5TiB2, in 680℃. Generally, samples with moderate amounts of TiB2 (2.5–5 Vol.%) have shown better microstructural and mechanical characteristics due to efficient impact of strengthening mechanisms with lower negative effects of destructive factors like porosity and agglomeration.

Ceramic particles reinforced copper matrix composites manufactured by advanced powder metallurgy: preparation, performance, and mechanisms

“…For the powder metallurgy technique, the mixing of powders is the key step to obtain Cu matrix composites with good dispersity and high compactness. In the process of powder mixing, the conventional method can only obtain the uniform dispersion powders through powder mixer, and the resulting powders remain loose and are prone to agglomeration [31]. In contrast, mechanical alloying optimizes the bonding and the dispersion between the powders during the mixing process [32].…”

Mechanical Properties of Titanium Diboride Particles Reinforced Aluminum Alloy Matrix Composites: A Comprehensive Review

“…Al/TiB 2 (0, 1.5, 2.5, 3.5, 5 and 10 wt % TiB 2 ) Powder metallurgy Compressive strength Mechanical property was greater than that of basic alloy. [49] A356/TiB 2 (0, 0.5, 1.5, 3, and 5 vol %)…”

Influence of aging and annealing processes on the properties of TiB2 particulate reinforced aluminum composites produced by powder metallurgy

“…Titanium diboride (TiB 2 ), being one of the hardest ceramics [6][7][8], is a vital reinforcement candidate to be used in aluminum metal matrix composites [5,. The techniques used to fabricate TiB 2 particle reinforced Al composites are salt-metal reaction , mechanical alloying and sintering [38][39][40][41][42], hot extrusion after mechanical alloying [43], stir casting [44,45], casting [46,47], squeeze casting [48], accumulative roll bonding [49], vacuum infiltration [50], hot isostatic pressing [51,52], pressure infiltration [53], reactive hot pressing [54], hot pressing [55], cold isostatic pressing and sintering [56], cold pressing and hot extrusion [57], and cold pressing and sintering [58][59][60][61][62].…”