Abstract
In this study, the effects of adding TiB2 particles to eutectic Al + Mg2Si phases in aluminum alloys were analyzed. The eutectic Al + Mg2Si phases were modified effectively when a large amount of TiB2 was added, and changes in the shape, size, and distribution of the eutectic Al + Mg2Si phases were confirmed using a polarizing microscope and FE-SEM. The crystal structure of the TiB2 particles and Mg2Si phases were analyzed using HR-TEM, and the analysis confirmed that the TiB2 particles can act as heterogeneous nucleation sites. This paper intends to clarify the principle of phase modification of the eutectic Al + Mg2Si phases by TiB2 particles and proposes a new mechanism to improve Mg2Si phase modification when TiB2 particles are added.
Highlights
Mg2Si is an intermetallic compound with excellent hardness (4.5 × 109 N/m2), modulus of elasticity (120 GPa), and low density (1.99 g/cm3) [1,2]
Coarse dendritic Mg2Si phases lead to nonhomogeneous stress concentration and reduce the mechanical properties of Al alloys
3.A1l.loEyutAecdtdiictiAonl + Mg2Si Phase Modification and Microstructure Change by Al–5Ti–1B Master Alloy AFdigduitrieon2 shows the change of the eutectic Al + Mg2Si phases with different Ti amounts in thFeigAurle–82Zsnh–o6wSsi–t4hMe cgh–a2nCgue aolflothyes.eTutheectCichAinle+seMsgc2rSipi tp-thyapsesewutiethctdicifAfelre+ntMTgi 2aSmi opuhnastses incatnhebAe sl–e8eZnnin–6thSie–m4Micgro–s2tCruucatullroeyos.f TthheebCahseinaellsoeys.cWriphte-nty0p.1e%euotfecTtiicwAasl +adMdegd2S, tihpehsahsaepse caonf btheeseeeunteicntitcheAml +icrMosgt2rSuicptuhraesoefstrheembaaisneeadlloayC
Summary
Mg2Si is an intermetallic compound (intermetallics) with excellent hardness (4.5 × 109 N/m2), modulus of elasticity (120 GPa), and low density (1.99 g/cm3) [1,2]. The shape, size, and distribution of Mg2Si phases have a significant effect on its mechanical properties. Coarse dendritic Mg2Si phases lead to nonhomogeneous stress concentration and reduce the mechanical properties of Al alloys. Mg2Si phase improvement can be achieved with the addition of P [5,9], Na [10], TiB2 [9,11,12], and Ca/Sb [13,14]. In the case of Mg2Si some studies have reported that a relatively large amount of TiB2 particles (approximately 5 wt.% [12] and 5 vol.% [18]) were required to effectively improve the eutectic Al + Mg2Si phases of Al–Mg2Si alloys. TiB2 particles (approximately 1 wt.% Ti) effectively improved the eutectic Al + Mg2Si phases of Al-based alloys [11]
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