Abstract
In the present study, aluminum alloys of the Al-Mg system with titanium diboride particles of different size distribution were obtained. The introduction of particles in the alloy was carried out using master alloys obtained through self-propagating high-temperature synthesis (SHS) process. The master alloys consisted of the intermetallic matrix Al-Ti with distributed TiB2 particles. The master alloys with TiB2 particles of different size distribution were introduced in the melt with simultaneous ultrasonic treatment, which allowed the grain refining of the aluminum alloy during subsequent solidification. It was found that the introduction of micro- and nanoparticles TiB2 increased the yield strength, tensile strength, and plasticity of as-cast aluminum alloys. After pass rolling the castings and subsequent annealing, the effect of the presence of particles on the increase of strength properties is much less felt, as compared with the initial alloy. The recrystallization of the structure after pass rolling and annealing was the major contributor to hardening that minimized the effect of dispersion hardening due to the low content of nanosized titanium diboride.
Highlights
At present, a wrought AA5056 alloy is widely used in aircraft engineering, maritime transport, and pipeline design due to high corrosion resistance and good weldability by traditional methods [1,2].The AA5056 alloy is mainly used as sheets
There are grains with size larger than 250 μm in the structure of the alloy AA5056 obtained without US (AA5056 + MA1 without US)
In the MA1 master alloy the size of most particles is 0.9 μm, while in the MA2 it is 2 μm, that leads to a half decrease in the number of potential solidification centers if we assume that this size should be around 1 μm
Summary
A wrought AA5056 alloy is widely used in aircraft engineering, maritime transport, and pipeline design due to high corrosion resistance and good weldability by traditional methods [1,2]. The AA5056 alloy is mainly used as sheets. The highest mechanical properties of this alloy are achieved by dispersion hardening with the introduction of elements such as zirconium or scandium [3,4,5]. Under the production of the rolled metal, additional deformation treatment affects the formation of the internal structure of an alloy that directly influences the change in its mechanical properties. In addition to dispersion hardening and deformation, there are methods to obtain high physical and mechanical properties of aluminum alloys, such as the modification of Metals 2019, 9, 1030; doi:10.3390/met9101030 www.mdpi.com/journal/metals
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