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The strengthening or hardening can also occur through the second phase mechanism, which is caused by the onset of phase alloy compounds.
Phase compounds formed are relatively hard and the movement of dislocations tends to be hampered by the second phase.
In addition, the formation of metal compounds has the influence of increasing the hardness of AlFeNiMg alloy.
Phase compounds formed will tend to hamper the movement of dislocations.
The dislocation movement that is impeded by phase compounds will have an impact on the increase in the strength of the metal.

The present research aimed to investigate the microstructure and hardness of twin roll strip cast aluminum alloys strips by varying the speed of roller cast.
The 30 rpm strip cast clearly consisted of a dendrite structure, with eutectics and intermetallic compounds located in the interdendritic regions.
The eutectics and intermetallic compounds in the interdentritic region mainly contained Mg and Si elements, which were the main source of the strengthening of Al-Mg-Si alloy.
Haga, High-Speed Twin-Roll Strip Casting of Al–Mg–Si Alloys with High Iron Content, Journal of Achievements in Materials and Manufacturing Engineering 20 (2007): 495-498
Watari, Twin roll casting of aluminum alloy strips, Journal of Materials Processing Technology 153 (2004): 42-47

The aim of this study is to analyze the microstructural variation of the Ti-15Zr alloy and some of that alloy’s mechanical properties with the addition of 5, 10, 15 and 20 wt% molybdenum.
Ho: Journal of Alloys and Compounds Vol. 488 (2009), p. 279-283
Luo: Journal of Alloys and Compounds Vol. 509 (2011), p. 6267-6272
Nakai: International Journal of Biomaterials Vol. 2011 (2011), 836587, 10 pages
Cao: Journal of Alloys and Compounds Vol. 509 (2011), p. 8235-8238

The peritectic alloys are commercially important; these are, for example, some types of steel, Ni-Al, Fe-Ni, Ti-Al, Cu-Sn alloys.
Müller: Numerical study on directional solidification of AlSi alloys with rotating magnetic fields under microgravity conditions, Journal of Materials Science, 39, (2004) 2011-2015 [3] S.
Lu: Influence of rotating magnetic field on the microstructure and phase content of Ni–Al alloy, Journal of Alloys and Compounds 509 (2011) 4835-4838
Chen: Fluid flow and microstructure formation in a rotating magnetic field during the directional solidification process, Journal of Alloys and Compounds 491 (2010) 395-401
Ohnaka: Periodic structure during unidirectional solidification for peritectic Cd-Sn alloys, Journal of Crystal Growth 210 (2000) 637-645 [8] R.

This will allow the use of magnets based on (Nd,Pr)2Fe14B compounds at cryogenic temperatures.
Alloys Compd. 681 (2016) 555-560
Alloys Compd. 751 (2018) 283-288
Alloys Comp. 351 (2003) 196–201
Andreev, Substituted (Nd,Pr)2Fe14B alloys: structural features and magnetic properties, Journal of Physics: Conference Series, 1236 (2019) 012016 (6)

Therefore, the high-efficiency and high-quality connection of aluminum alloy/stainless steel alloys has attracted wide attention of researchers.
This paper is aimed at the lap joint of high-strength steel on the upper and aluminum alloy.
The intermetallic compounds at the weld/aluminum alloy interface are mainly in two forms: A free "needle" Fe4Al13 intermetallic compound in the aluminum alloy base material, close to the "tongue" Fe2Al5 intermetallic compound on the weld side
Chinese Journal of lasers, 35 (2008) 1783-1788
The Chinese Journal of Nonferrous Metals, 24 (2014) 678-688

Co-extrusion of Aluminium-Titanium-Compounds N.
Reinforcing materials are mostly steel, titanium-alloys and nickel based alloys [6].
Besides, nickel and cobalt basis alloys are also used.
The aim of the presented investigations is to show the technical feasibility of the co-extrusion of aluminium-titanium-compounds.
Journal of Materials Science Letters 9 (1990) 432 [17] Wang, G.; Dahms, M.: Synthesizing gamma-TiAl alloys by reactive powder processing.

Among various resulted intermetallic compounds, the β-Al5FeSi phase with sharp ended acicular structure is responsible for the higher stress accumulation.
As manganese plays an important role in combating the detrimental effect of iron in aluminum based alloys, this present study aimed to study the parameters for manganese addition to improve the mechanical properties of the aluminum based alloy.
David, Aluminum and Aluminum Alloys, Materials Park USA., 1993
Shabestari, The Effect of iron and manganese on the formation of intermetallic compounds in aluminum-silicon alloys, Materials Science and Engineering.
Pai, A Study on the Structure, Age Hardening and Mechanical Characteristics of Mn and Ca Added Al-7Si-0.3Mg-0.6Fe Alloys, Journal of Alloys Compounds.453 (2008)167-173.

XRD (Rigaku Ultima IV) was applied to determine the chemical compounds and phases formed in the alloys.
-Y., et al., In vitro corrosion of micro-arc oxidation coating on Mg-1Li-1Ca alloy-The influence of intermetallic compound Mg2Ca, Journal of Alloys and Compounds, 764 (2018) 250-260
Balla, Effect of heat treatment on microstructure, mechanical, corrosion and biocompatibility of Mg-Zn-Zr-Gd-Nd alloy, Journal of Alloys and Compounds, 821 (2020) 153462
[58] Candan, S., et al., Effects of titanium addition on mechanical and corrosion behaviours of AZ91 magnesium alloy, Journal of Alloys and Compounds, 509 (5) (2011) 1958-1963.
-S., et al., Corrosion resistance of a ceria/polymethyltrimethoxysilane modified Mg-Al-layered double hydroxide on AZ31 magnesium alloy, Journal of Alloys and Compounds, 764 (2018) 913-928

In this manner the spatial structure of Cu6Sn5 and the Ag3Sn intermetllic compounds (IMCs) was highlighted.
The microstructure of the composed binary or ternary alloys is usually different from that of the eutectic Sn-Pb solder.
In these alloys according to the ternary phase diagram of the SAC alloys in Fig. 1 there are three possible intermetallic compounds that may be formed: Ag3Sn, Cu6Sn5 and Cu3Sn.
Yu et al. ”Intermetallic compounds growth between Sn–3.5Ag lead-free solder and Cu substrate by dipping method” Journal of Alloys and Compounds 392 (2005), pp. 192–199
Tsao ” Evolution of nano-Ag3Sn particle formation on Cu–Sn intermetallic compounds of Sn3.5Ag0.5Cu composite solder/Cu during soldering” Journal of Alloys and Compounds 509 (2011). pp 2326–2333