Complex Ferroalloys and Other Master Alloys

Abstract Grain refinement has a significant influence on the improvement of mechanical properties of magnesium alloys. In this study, a series of Al–Ti–C-xGd (x = 0, 1, 2, 3) master alloys as grain refiners were prepared by self-propagating high-temperature synthesis. The synthesis mechanism of the Al–Ti–C-xGd master alloy was analyzed. The effects of Al–Ti–C-xGd master alloys on the grain refinement and mechanical properties of AZ31 (Mg-3Al-1Zn-0.4Mn) magnesium alloys were investigated. The results show that the microstructure of the Al–Ti–C-xGd alloy contains α-Al, TiAl3, TiC and the core–shell structure TiAl3/Ti2Al20Gd. The refining effect of the prepared Al–Ti–C–Gd master alloy is obviously better than that of Al–Ti–C master alloy. The grain size of AZ31 magnesium alloy was reduced from 323 μm to 72 μm when adding 1 wt.% Al–Ti–C-2Gd master alloy. In the same condition, the ultimate tensile strength and elongation of as-cast alloy were increased from 130 MPa, 7.9% to 207 MPa, 16.6% respectively.

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Grain Refinement Efficiency in Commercial-Purity Aluminum Influenced by the Addition of Al-4Ti Master Alloys with Varying TiAl3 Particles

Materials ◽

10.3390/ma9110869 ◽

2016 ◽

Vol 9 (11) ◽

pp. 869 ◽

Cited By ~ 4

Author(s):

Jianhua Zhao ◽

Jiansheng He ◽

Qi Tang ◽

Tao Wang ◽

Jing Chen

Keyword(s):

Grain Refinement ◽

Commercial Purity ◽

Refinement Efficiency ◽

Master Alloys ◽

Commercial Purity Aluminum

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Corrosion Behavior, Microstructure and Mechanical Properties of Novel Mg-Zn-Ca-Er Alloy for Bio-Medical Applications

Metals ◽

10.3390/met11030519 ◽

2021 ◽

Vol 11 (3) ◽

pp. 519

Author(s):

Devadas Bhat Panemangalore ◽

Rajashekhara Shabadi ◽

Manoj Gupta

Keyword(s):

Mechanical Properties ◽

Corrosion Behavior ◽

Base Material ◽

Hot Extrusion ◽

Secondary Phases ◽

Zinc Alloys ◽

Alloying Additions ◽

Degradation Rates ◽

Master Alloys ◽

Melt Deposition

In this study, the effect of calcium (Ca) and erbium (Er) on the microstructure, mechanical properties, and corrosion behavior of magnesium-zinc alloys is reported. The alloys were prepared using disintegrated melt deposition (DMD) technique using the alloying additions as Zn, Ca, and Mg-Er master alloys and followed by hot extrusion. Results show that alloying addition of Er has significantly reduced the grain sizes of Mg-Zn alloys and also when compared to pure magnesium base material. It also has substantially enhanced both the tensile and the compressive properties by favoring the formation of MgZn2 type secondary phases that are uniformly distributed during hot-extrusion. The quaternary Mg-Zn-Ca-Er alloy exhibited the highest strength due to lower grain size and particle strengthening due to the influence of the rare earth addition Er. The observed elongation was a result of extensive twinning observed in the alloys. Also, the degradation rates have been substantially reduced as a result of alloying additions and it is attributed to the barrier effect caused by the secondary phases.

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New Zn3Mg-xY Alloys: Characteristics, Microstructural Evolution and Corrosion Behavior

Materials ◽

10.3390/ma14102505 ◽

2021 ◽

Vol 14 (10) ◽

pp. 2505

Author(s):

Catalin Panaghie ◽

Ramona Cimpoeșu ◽

Bogdan Istrate ◽

Nicanor Cimpoeșu ◽

Mihai-Adrian Bernevig ◽

...

Keyword(s):

Galvanic Corrosion ◽

Intermetallic Phase ◽

Young Modulus ◽

Induction Melting ◽

X Ray Diffraction ◽

Medical Field ◽

Pure Zinc ◽

X Ray ◽

Knowing That ◽

Master Alloys

Zinc biodegradable alloys attracted an increased interest in the last few years in the medical field among Mg and Fe-based materials. Knowing that the Mg element has a strengthening influence on Zn alloys, we analyze the effect of the third element, namely, Y with expected results in mechanical properties improvement. Ternary ZnMgY samples were obtained through induction melting in Argon atmosphere from high purity (Zn, Mg, and Y) materials and MgY (70/30 wt%) master alloys with different percentages of Y and keeping the same percentage of Mg (3 wt%). The corrosion resistance and microhardness of ZnMgY alloys were compared with those of pure Zn and ZnMg binary alloy. Materials were characterized using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), linear and cyclic potentiometry, and immersion tests. All samples present generalized corrosion after immersion and electro-corrosion experiments in Dulbecco solution. The experimental results show an increase in microhardness and indentation Young Modulus following the addition of Y. The formation of YZn12 intermetallic phase elements with a more noble potential than pure Zinc is established. A correlation is obtained between the appearance of new Y phases and aggressive galvanic corrosion.

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