Effect of alloyed Ca on the microstructure and corrosion properties of extruded AZ61 Mg alloy

Baek, Soo-Min; Kim, Hyeon Ju; Jeong, Hu Young; Sohn, So-Dam; Shin, Hyung‐Joon; Choi, Kyunghee; Lee, Ki-Suk; Lee, Jung Gu; Yim, Chang Dong; You, Bong Sun; Ha, Heung Yong

doi:10.1016/j.corsci.2016.07.011

Cited by 66 publications

(16 citation statements)

References 43 publications

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“…From the maps, the intermetallic particles have greater Volta potentials than the a-Mg matrix for both as-cast and asextruded alloys, which reveals that the intermetallic particles are electrochemical nobler than a-Mg matrix. Zhang et al [25] and Baek et al [29] also reached analogous findings about the nobler second phases. In general, the intermetallic particles act as micro-cathode, and matrix acts as micro-anode in the micro-galvanic corrosion.…”

Section: Immersion Testmentioning

confidence: 55%

Enhanced Strength and Corrosion Resistance of Mg–2Zn–0.6Zr Alloy with Extrusion

Wang

Song

Cai

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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The microstructure, mechanical properties and corrosion behavior of Mg-2Zn-0.6Zr alloy under the as-cast and asextruded conditions were investigated. Microstructure analysis indicated the remarkable grain refinement by extrusion, as well as notable reductions in volume fraction and size of precipitate phases. As compared with the as-cast alloy, the asextruded alloy exhibited better mechanical performance, especially in yield strength which was promoted from 51 to 194 MPa. Refined grains, dispersive precipitate phases and texture were thought to be the main factors affecting the improved performance in strength. The electrochemical measurement and immersion test revealed the corrosion rate of Mg-2Zn-0.6Zr alloy by extrusion decreased from 1.68 to 0.32 mm/year. The reasons for the enhanced corrosion resistance were mainly attributed to the decreased volume fraction and Volta potential of the precipitate phases, the refinement of the grain size, as well as the formation of more protective corrosion film.

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Section: Immersion Testmentioning

confidence: 55%

Enhanced Strength and Corrosion Resistance of Mg–2Zn–0.6Zr Alloy with Extrusion

Wang

Song

Cai

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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“…All SKPFM measurements were conducted at the ambient temperature. The details of the corrosion-related tests and SKPFM measurement are available in previous studies [16,17]. Figure 1a,b show the scanning electron microscopy (SEM) micrographs of the extruded ZK60 and ZKC601 alloys, respectively.…”

Section: Methodsmentioning

confidence: 99%

Influence of Intermetallic Particles on the Corrosion Properties of Extruded ZK60 Mg Alloy Containing Cu

Baek

Kim

2018

Metals

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The microstructure and corrosion behavior of the extruded ZK60 Mg alloys with different Cu content were comparatively investigated. The ZK60 alloy had a microstructure consisting of α-Mg grains with intermetallic MgZn 2 and Zn 2 Zr 3 particles. The addition of 1 wt % Cu resulted in the additional presence of CuMgZn particles. In a 0.6 M NaCl solution at 25 • C, the corrosion rate of the alloy with the added Cu appeared to be about 16% faster than that of the alloy without the addition of Cu. The factors affecting the degraded corrosion resistance of the Cu-added ZK60 alloy are discussed.

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“…Aluminum is the most important alloying element for Mg, both for casting- and wrought alloys, as it increases the castability and mechanical strength and enables the ability of precipitation hardening [ 8 , 9 ]. Calcium is used for grain refinement of the cast material [ 10 , 11 ]; it can weaken the texture in wrought material [ 12 , 13 ] and increase both the oxidation [ 14 , 15 ] and corrosion [ 16 , 17 , 18 ] resistance. Additionally, it allows the formation of IMPs with various structures (C36, C14, C15), depending on the Al- and Ca contents as well as the Ca/Al ratio [ 19 , 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Investigations of High-Strength Mg–Al–Ca–Mn Alloys with a Broad Range of Ca+Al Contents

et al. 2021

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The low mass and high specific stiffness of Mg alloys make them particularly interesting as means of transportation. Due to further desirable properties, such as good machinability and excellent castability, Mg alloys have gained acceptance as castings in high-volume applications, such as gearbox housings and automotive steering wheels. However, in forming processes, such as extrusion and forging, Mg alloys find little to no industrial use at the moment. The reasons for this are their poor formability, which is reflected in limited processing speeds and low ductility, and their modest mechanical performance, compared to competing materials, such as Al alloys and high-strength steels. Much research is being conducted worldwide on high-strength Mg alloys, most of which rely on high levels of rare earths, making these materials both ecologically and economically questionable. Here, it is shown that high yield strengths (> 300 MPa) can be achieved in the Mg–Al–Ca system while maintaining good ductility, using only low-cost elements. The investigations have shown that these properties can be adjusted over broad alloy compositions, which greatly simplifies both the processing and recyclability.

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Effect of alloyed Ca on the microstructure and corrosion properties of extruded AZ61 Mg alloy

Cited by 66 publications

References 43 publications

Enhanced Strength and Corrosion Resistance of Mg–2Zn–0.6Zr Alloy with Extrusion

Enhanced Strength and Corrosion Resistance of Mg–2Zn–0.6Zr Alloy with Extrusion

Influence of Intermetallic Particles on the Corrosion Properties of Extruded ZK60 Mg Alloy Containing Cu

Investigations of High-Strength Mg–Al–Ca–Mn Alloys with a Broad Range of Ca+Al Contents

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