Al 4043 is commonly used as a filler material for welding of aluminium-based components. In the present research work, Al 4043/xTiB₂ (titanium diboride) microcomposites (x = 2, 4, 6, 8 and 10 wt%) are fabricated by dilution of Al 4043/10TiB₂ in situ master composites synthesized by salt-melt reaction. To synthesize the nanocomposites, in situ Al 4043/10TiB₂ composites are re-melted, diluted and ultrasonic-treated for 5 min. The microstructural analysis revealed that ultrasonic treatment (UT) is beneficial on improving the dispersion and refinement of TiB₂ particles. UT of Al 4043/2TiB₂ composites reduced the size of TiB₂ particles from ~ 1270 to ~ 25 nm. At the same time, the efficiency of UT on agglomerate breakage and particle size reduction decreases with the increase in amount of reinforcement. The hindrance generated by increased amount of reinforcements to ultrasonic wave propagation and allied impairment on cavitation implosion is proposed as the reason for the reduction in efficiency of UT. The mechanical property analysis revealed that UT-assisted size reduction and agglomerate breakage of TiB₂ particles significantly increase both hardness and compressive strength of in situ composites. The results revealed that the compressive strength of TiB₂-reinforced Al 4043/10TiB₂ micro- and nanocomposite increased up to ~ 90 and ~ 150 MPa, respectively_. Also, a significant improvement in hardness was observed in the reinforced Al 4043/10TiB₂ micro- and nanocomposites by ~ 94% and ~ 98%, respectively, compared to the monolithic alloy.

Al 4043通常用作焊接铝基部件的填充材料。在当前的研究工作中， 通过稀释盐熔合成的Al 4043 / 10TiB ₂原位母料，制备了Al 4043 / xTiB ₂（二硼化钛）微复合材料（x = 2、4、6、8和10 wt％）。反应。为了合成纳米复合材料，将Al 4043 / 10TiB ₂复合材料重新熔化，稀释并超声处理5分钟。显微组织分析表明，超声处理（UT）有利于改善TiB ₂颗粒的分散性和细化度。Al 4043 / 2TiB ₂复合材料的UT减小了TiB ₂的尺寸粒子从〜1270到〜25 nm。同时，随着增强量的增加，UT对附聚物破裂和粒度减小的效率降低。提出了由增加的增强量对超声波传播产生的阻碍以及空化内爆的相关损害，这是导致UT效率降低的原因。力学性能分析表明，UT辅助的尺寸减小和TiB ₂颗粒的团聚破碎显着提高了原位复合材料的硬度和抗压强度。结果表明，TiB ₂增强的Al 4043 / 10TiB ₂微复合材料和纳米复合材料的抗压强度分别提高到〜90和〜150 MPa _。同样，与单块合金相比，在增强的Al 4043 / 10TiB ₂微复合材料和纳米复合材料中，观察到的硬度显着提高，分别达到〜94 ％和〜98 ％。