The Effect of Milling Time on the Mechanical Properties of ZA27/Al₂O₃ Nanocomposites

Abstract

In this study, ZA27/Al 2 O 3 nanocomposites reinforced with 1 vol.% Al 2 O 3 nanoparticles were produced using mechanical milling and hot pressing method. The milling time was changed between 1h to 8h. The hot pressing prose was performed in vacuum at 432 0 C and pressure of 600 MPa. The effect of milling time on the density, hardness and tensile strength of the ZA27/Al 2 O 3 nanocomposites were investigated. The results show that the increase in milling time resulted as a decrease in the density of nanocomposite due to the change in hardness of that. It was observed that the tensile strength of the nanocomposites reached their maximum value (163 MPa) at milling time of 2h and then decreased linearly with increasing milling time. Moreover, the hardness of the nanocomposite milled for 8h was obtained as 155 HB which is about 9 % higher than the hardness of nanocomposite milled for 1h. A linearly increase was also observed the hardness of nanocomposites.

Effect of Milling Time on Physical and Mechanical Properties of Ceramics Derived from the CaO-MgO-Al2O3-SiO2 System

“…As a result of the increasing hardness of raw materials, the tensile strength of bulk samples increased. However, after 1 hour of milling, the tensile strengths decreased rapidly because increasing the ball-milling caused more work hardening, making the ceramics brittle [24]. While the highest tensile strength was obtained at the 1 h milling sample, the lowest value was obtained at the 2 h milling sample, which was 11.72 MPa.…”

“…The work hardening influence of the milling process can explain the change in porosity as milling time increases. The mixed powders are subjected to high-energy collisions between ceramic particles and milling balls during the milling process, resulting in increased powder hardness [24]. Meanwhile, particle size and the specific surface area also impact density and porosity.…”

Mechanical and wear performance of A356/Al2O3 aluminum nanocomposites by considering the mechanical milling time and microstructural properties

“…and solid-state (powder metallurgy). There are also derivative applications such as hot pressing, compocasting and friction stir process (Çelebi et al , 2018; Bobić et al , 2019; Akbari and Asadi, 2021; Akbari and Asadi, 2022). Powder metallurgy (PM), a solid-state production method, provides low processing temperatures.…”

Enhancing of ZA-27 alloy wear characteristics by addition of small amount of SiC nanoparticles and its optimisation applying Taguchi method

“…Recently, based on the positive results with MMCs, there is an increasing interest for researches on metal matrix nanocomposites (MMnCs) with ZA-27 alloy matrix and incorporated nanoparticles. Influences of various nanoparticles have been investigated, namely SiC [11][12][13][14], Al 2 O 3 [11,12,15,16], ZnO [17], TiB 2 [18], B 4 C [19,20], graphite [21], graphene [22], and its combinations, Al 2 O 3 and graphite [23,24], B 4 C and graphite [25] and B 4 C and graphene [26].…”