Registration Number
0220U101682,
0117U000257
, R & D reports
Title
Physico-chemical principles of nanostructured metal alloys development in terms of pulse treatment of their melts
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Head
Ткаченко Володимир Григорович,
Registration Date
18-02-2020
Organization
Institute for Problems in Materials Science
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The physico-chemical principles of strengthening are formulated for nanoreinforced magnesium and aluminum-based alloys within the framework of the cluster model to be accepted for liquid alloys. On this basis, a new magnesium alloy of the Mg-Al-Ca-Ce-Er system was developed, which possesses higher creep resistance because of the formation of natural strengthening nanoparticles (probably nm Al53Mg27Er14Ce5) in the matrix and at grain boundaries. High performance this alloy (0.35% of total deformation at 150 ° C and 70 MPa for 200 hours, improved fluidity and low cost) makes it suitable for die casting of automotive parts. The know-how method of the introduction of nanosized refractory particles, in particular, ZrO2, was developed to ensure their uniform distribution in the magnesium matrix. It is found that the magneto-pulse treatment of the AK7–4% Fe melt significantly (three times) increases the rate of the formation of the eutectic components. The observed effect leads to a significant reducing the alloy structural components sizes and an increase in the volume fraction of the intermetallic phase Al9Fe2Si2 and pure silicon. The peculiarities of crystallization kinetics of the ternary Al-Ni-Fe system are caused by the sequence of alloying elements addition. It is suspected that a significant supersaturation of a solid solution by nickel atoms is due to the Al3Ni type liquid clusters embedded under crystallization into the aluminum matrix. This suggestion explains the abnormally high value of Young's modulus and the high yield strength of the alloy. The AM50 alloy (E = 41-43 GPa) modified by synthesized quasi-crystalline Mg80Cd15Ca5 alloy with a high Young's modulus of E= 63-80 GPa gives a much higher value of E > 50 GPa.
Product Description
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Kondrashev Oleksandr I.
Maksymchuk Ihor M
Malka Oleksandr M
Medalovych Nina P
Romanko Petro M
Frizelʹ Viktor V
Khryplyvyy Anatoliy O
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2020-04-02
