Precipitation strengthening in an ultralight magnesium alloy

Tang, Shengqiang; Xin, Tongzheng; Xu, Weixing; Miskovic, David M.; Sha, Gang; Quadir, Zakaria; Ringer, Simon P.; Nomoto, Keita; Birbilis, Nick; Ferry, Michael

doi:10.1038/s41467-019-08954-z

Cited by 116 publications

(48 citation statements)

References 27 publications

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“…The widely accepted understanding suggests that precipitates do not prevent twin nucleation, but that they might strongly interfere with the process of twin growth [24,75,81,[86][87][88]. For instance, Stanford et al [89] observed a higher density of small twins in age-hardened Mg-Zn alloys than in precipitate-free samples.…”

Section: Precipitation Effectsmentioning

confidence: 99%

High-throughput screening of strength and creep properties in Mg-Zn alloys

Li¹

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Looking back to the four years and three months that my Ph.D. journey took at IMDEA Materials Institute and the Polytechnic University of Madrid, I wish to express my sincerest and deepest gratitude to many people who offered me their support and help since the first day I arrived at IMDEA. First of all, I would like to express my most sincere gratitude to my supervisor Dr. Jon Molina. We did not even have a Skype meeting before and we only met after two months since I arrived at IMDEA. Thanks for your trust, for providing me with the opportunity to work in your group and for guiding me fully and patiently along this journey. At the beginning, I was new to the nanomechanical field, but you explained patiently the fundamental theory to me and checked the work carefully during each meeting. Gradually, you gave me a lot of freedom and your passion encouraged me to get deeper and deeper into the field. You helped me overcoming the difficulties and avoiding the mistakes that we often make when we work in a quick, eager and impetuous way, without deeper thinking. I still remember one day clearly, when you made me realize how natural aging at room temperature could influence the results on supersaturated Mg-Zn solid solutions. This made us introduce the topic of Zn distribution by studying the diffusion couple in the as-quenched, room aged and peak aged conditions. I also want to thank you for teaching me to think in a critical way, to improve my scientific writing and to help me differentiate between experimental evidence and mere speculation. Many thanks for all your wisdom guidance and continuous encouragement to help me grow during my study and work at IMDEA. Without your scholarly inputs and valuable guidance, this thesis would have not been possible. Your passion and solid background in materials science inspire me to continue working on materials research in the future. I feel so grateful and fortunate for having been working under your supervision and for growing up in our pleasant and exciting group. I also own my most sincere thanks to my other supervisor, Dr. Yuwen Cui, with whom I worked since I joined IMDEA Materials. Despite your departure one year later to Nanjing Tech University, you have remained deeply involved in my thesis. Your guidance, great patience and insightful vision was essential to introduce me in the field of high-throughput development of Mg alloys. I also wish to thank IMDEA Materials Institute for offering me such a fantastic environment for scientific research. I'm grateful for the financial support from the China Scholarship Council. My special thanks go to my colleagues: Dr. Miguel Monclus, thanks for your assistance with performing nanomechanical tests, which were always very timeconsuming; and Dr. Miguel Castillo, thanks for your help with the TEM characterizations and for training in the FIB. Special thanks to Dr. Lingwei Yang and Dr. Chuanyun Wang. You two taught and helped me a lot in micropillar testing and TEM lamellar preparation and also helped me analyse the data even during...

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Section: Precipitation Effectsmentioning

confidence: 99%

High-throughput screening of strength and creep properties in Mg-Zn alloys

Li¹

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“…In recent years, many series of magnesium alloys have been reported. For example, magnesium alloys with different rare earth elements [6,7], magnesium alloys with different elements (such as Al, Zn, Sn, Mn, and Li) have exhibited excellent properties [8][9][10]. The mechanical properties of the magnesium alloys can be strengthened by plastic deformation processing such as extrusion or rolling [11,12].…”

Section: Introductionmentioning

confidence: 99%

Effect of rolling deformation on microstructure and mechanical properties of Mg-6Sn-3Al-1Zn alloy

Wei

Zhang

Shi

et al. 2020

Mater. Res. Express

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The Mg-6Sn-3Al-1Zn alloys treated with the solid solution were induced 25%, 45%, 65% and 85% rolling deformation at 400°C, respectively. The microstructures of as-rolled magnesium alloys were analyzed by XRD, OM, SEM and TEM, the mechanical properties were also measured. The results revealed that the rolled Mg-6Sn-3Al-1Zn alloys were composed of α-Mg matrix phase and Mg 2 Sn second phase, Mg 2 Sn distributed at the grain boundaries and intra-grains. With the increasing of the rolling deformation, the volume fraction of Mg 2 Sn phase distributed at the grain boundaries firstly decreased and then stabilized, the average size of Mg 2 Sn phase firstly increased and then decreased, the Mg 2 Sn phase distributed inside the grains gradually transformed from a rod shape to a spherical shape, the volume fraction of the recrystallized grains gradually increased and the average size of the recrystallized grains early decreased and eventually almost unchanged. When the rolling deformation exceeded 25%, the value of tensile strength and Vickers hardness of the Mg-6Sn-3Al-1Zn alloys increased with the rolling deformation. However, when the rolling deformation exceeded 65%, the elongation of the magnesium alloys diminished, however, the strength of as-rolled magnesium alloys did not increase significantly when the amount of rolling deformation increased from 65% to 85%. The mechanical properties were the best when the amount of rolling deformation reached 65%. Meanwhile, the volume fraction and area of Mg 2 Sn phase distributed on the grain boundaries were 2.9%, 105.5 μm 2 , the volume fraction and average grain size of recrystallized grains were 87% and 2.2 μm, respectively. In addition, it was worth noting that the Mg 2 Sn phase distributed inside the grains was radically converted into a spherical shape, and the tensile strength, elongation, hardness of the alloy were 317 MPa, 13% and 77.52 HV, respectively.

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“…Although there exists a plethora of studies on the processing, microstructure and physical properties of Mg-based alloys (see e.g., [9][10][11][12][13][14][15][16][17]), to date, there remains a limited reporting, characterisation and rationalisation of processing-structure-properties relationships for AM produced Mg alloys [18][19][20]. In part this is because the production of Mg-based alloys by AM has been considered complicated, owing to a range of factors that could include: safety concerns associated with the reactive nature of Mg powder; the superheating and boiling / evaporation of Mg via interaction with laser based methods; a tendency for ignition in the presence of common environments (Mg can burn under air or N 2 ), and even supply chain issues for Mg powder of suitable size and composition (relevant to powder based AM).…”

Section: Introductionmentioning

confidence: 99%

A detailed microstructural and corrosion analysis of an additively manufactured magnesium alloy produced by selective laser melting

Esmaily¹,

Zeng²,

Mortazavi³

et al. 2020

Preprint

Self Cite

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Magnesium (Mg) alloys have promising potentials for lightweight and biomedical applications. Although there has been a recent interest in producing Mg alloys (including AZ, ZK and WE series) using additive manufacturing (AM), the process-structure-corrosion properties relationships in AM Mg alloys are yet to be understood. Herein, the production of Mg alloy WE43 was achieved by selective laser melting (SLM). The alloy was investigated after SLM, hot isostatic pressing (HIP) as well as an additional solutionising heat treatment. Specimens were carefully characterised, whilst assessed and contrast relative to the conventionally cast alloy counterpart. Characterisation included detailed microstructural analysis employing analytical transmission electron microscopy, X-ray mapping, and electron backscatter diffraction, which revealed the SLM prepared specimens possess a unique microstructure comprising fine grains growing with a strong [0001] texture along the building direction. The SLM prepared specimens also revealed a low fraction of process-induced and metallurgical defects, reaching < 0.1% after optimising the SLM parameters and HIP treatment. The SLM prepared WE43 was found to be cathodically more active relative to the cast WE43 because of a fine distribution of zirconium-, yttrium- and oxygen-rich particles as well as the alterations in the chemical composition of the solid-solution matrix originating from the high cooling rates of SLM. It was revealed that the oxide particles were mainly sourced by powder and thus it is hypothesised that the corrosion of SLM prepared Mg alloys could be greatly improved once the influence of powder characteristics is further understood and controlled.

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Precipitation strengthening in an ultralight magnesium alloy

Cited by 116 publications

References 27 publications

High-throughput screening of strength and creep properties in Mg-Zn alloys

High-throughput screening of strength and creep properties in Mg-Zn alloys

Effect of rolling deformation on microstructure and mechanical properties of Mg-6Sn-3Al-1Zn alloy

A detailed microstructural and corrosion analysis of an additively manufactured magnesium alloy produced by selective laser melting

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