Stress-Relaxation Behavior of Magnesium-3Gadolinium-2Calcium-Based Alloys at Elevated Temperatures

Mo, Ning; Tan, Qiyang; Jiang, Bin; Pan, Fusheng; Zhang, Mingxing

doi:10.1007/s11661-017-4324-2

Cited by 12 publications

(6 citation statements)

References 30 publications

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“…3 However, RE elements are still too expensive to be widely used for this purpose. 4 Among all non-RE alloying elements, Ca is expected to be an effective alloying element in the development of creep-resistant Mg alloys due to its low cost and even lower density than Mg. It has been reported that the creep resistance of most widely used Mg-Al based alloys can be enhanced by Ca addition, 5,6 since Ca can consume Al solutes and introduce more thermally stable phases or precipitates.…”

Section: Introductionmentioning

confidence: 99%

The Role of Second Phases on the Creep Behavior of As-Cast and Hot-Extruded Mg-Ca-Zr Alloys

You

Huang

Dieringa

et al. 2019

JOM

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The effect of second phases on the creep behavior of Mg-Ca-Zr alloys was investigated. Casting and hot-extrusion processes were performed to prepare Mg-xCa-0.5Zr (x = 0 wt.%, 0.3 wt.% and 0.6 wt.%) alloys with different morphologies and distributions of second phases. The as-cast microstructures of Mg-Ca-Zr alloys consisted of an Mg matrix and coarse Mg 2 Ca intermetallic compounds distributed at the grain boundaries. The hot-extruded microstructures exhibited finer Mg 2 Ca spherical particles and precipitates distributed homogeneously inside the matrix and along the grain boundaries. The results of creep tests suggested that the viscous glide of dislocation and dislocation climb were the dominant creep mechanisms of Mg-Ca-Zr alloys crept at 200°C. The creep property was strongly related to the morphology and distribution of the Mg 2 Ca phases. The finer and more homogeneously distributed particles showed a better strengthening effect than the coarser intermetallic compounds distributed along the grain boundaries.

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Section: Introductionmentioning

confidence: 99%

The Role of Second Phases on the Creep Behavior of As-Cast and Hot-Extruded Mg-Ca-Zr Alloys

You

Huang

Dieringa

et al. 2019

JOM

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“…Hence, the SRO hypothesis needs further investigation. But, previous studies [124][125][126] indicated that solid solution strengthening of dilute Y, Gd and Nd solutes may play a more important role than precipitation strengthening in improvement of the creep resistance of Mg alloys.…”

Section: Solid Solution Strengtheningmentioning

confidence: 98%

“…Gao et al [161] reported that the peak-aged Mg-1Ca-1Zn-0.6Zr (wt.%) alloy exhibited the minimum creep rates at a range of stresses at 150 ℃ about two order of magnitude lower than that of the peak-aged AZ91 alloy, owing to the presence of thermally stable discs on the basal plane of the Mg. On the other hand, unlike the Mg-REs, Mg-Sn and Mg-Zn systems, the low solid solubility of Ca in Mg (0.82at.%) limits the precipitation hardening response in Ca-containing Mg alloys. Nevertheless, effective solid solution strengthening effect by dilute Ca has been suggested in several studies [125,126]. As stated in Section 3.2.2, the tendency of Ca solutes for developing SRO in solid solutions is comparable to those of REs.…”

Section: Mg-ca Alloysmentioning

confidence: 99%

“…This implies that there is high potential to develop low cost creep-resistant Mg alloys using Ca because the market price of Ca is much lower than Y, Nd and Gd. Furthermore, the recent work [126] on the new Mg-3Gd-2Ca based alloys illustrated that Ca solute played a similar role as Gd solute in contributing to the hightemperature strength and creep resistance. This provides a potential approach to reduce REs addition in creep-resistant Mg alloys by exploitation of Ca's promising solid solution strengthening effect.…”

Section: Mg-ca Alloysmentioning

confidence: 99%

“…At the same addition level of about 1 at.%, Gd, Y, Nd and Ca containing Mg binary alloys exhibited superior strength and stress relaxation resistance at elevated temperatures as shown in Fig.2-22. Mo et al[126] subsequently developed a number of Mg-3Gd-2Ca (wt.%) based creep-resistant alloys based on this outcome. Due to the comparable effect of Ca solute to REs in producing SRO as predicted, 2 wt.% Ca was added to replace the high addition level of Gd in the published alloy Mg-6Gd-2Zn-0.6Zr alloy[118].…”

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confidence: 99%

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Development of new creep-resistant magnesium alloys with low cost

Mo¹

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As the lightest metallic structural materials, magnesium (Mg) and its alloys have attracted increasing interest in automotive and aerospace industries because of the benefits to energy conservation and improved fuel efficiency through significant weight reduction. However, the insufficient high-temperature mechanical and creep properties of magnesium alloys have restricted the wider applications in industries, such as the powertrain components. So far, rare earth elements (RE)-The four-year PhD study is really a long journey, but I would not have imagined before that this moment will come to draw the full stop to this wonderful journey. I really enjoyed the beautiful views around my working office, the UQ lake with all lovely creatures, the jacaranda petals dancing in the air and the all-year golden sunshine. Looking back to these years, I went through confusion, hardship, tiredness and sadness, also gathered achievability, happiness, grow-up and love. I never forget every failure of experiments, every day and night that I worked in the lab, and every delight brought by the publications of my work. This PhD study not just grants me a title or a degree, more importantly, guides me to the right attitude towards learning, which will be a lifelong benefit. I am thankful to those who helped and accompanied me to reach my port of destination. In the following sentences, I would like to take this opportunity to express my gratitude to them.The sincere appreciation of mine must be firstly delivered to my principal supervisor, Prof.Mingxing Zhang, for his guidance throughout the course, bondless generosity, kindness and patience.Before studying in UQ as an exchange undergraduate student in 2013, I would never imagine that I will engage in PhD study one day. I thank him for giving me such a precious opportunity to participate in this meaningful project and work alongside him in his research group. His great attitude and passion for research not only teach me what true scientist is all about, but also significantly inspire me on my own project. More importantly, I would like to express my heartfelt thanks for his unconditional support to my PhD study and daily life, which greatly motivate me to complete my PhD project. I wish to thank my associated supervisor Dr. Michael Bermingham and pre-associated supervisor Dr. Carlos H. Cá ceres, for their invaluable guidance and support to my PhD project. Their constructive suggestions and rigorous academic attitude strongly influenced me on my daily research work.Especially, I would like to thank Dr. Michael Bermingham for his great help to paper writing, which is beneficial to me a lot. I would like to express my great gratitude to Prof. Fusheng Pan and Prof. Bin Jiang for their insightful advices on my project and their kindly help with the use of transmission electron microscopy in the University of Chongqing. I'm also thankful to Dr. Yuanding Huang and Dr. Hajo Dieringa for their great support to creep testing experiments and considerable arrangement during my academic visiting i...

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The high-temperature oxidation resistance properties of magnesium alloys alloyed with Gd and Ca

Yuan

et al. 2021

J Mater Sci

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Stress-Relaxation Behavior of Magnesium-3Gadolinium-2Calcium-Based Alloys at Elevated Temperatures

Cited by 12 publications

References 30 publications

The Role of Second Phases on the Creep Behavior of As-Cast and Hot-Extruded Mg-Ca-Zr Alloys

The Role of Second Phases on the Creep Behavior of As-Cast and Hot-Extruded Mg-Ca-Zr Alloys

Development of new creep-resistant magnesium alloys with low cost

The high-temperature oxidation resistance properties of magnesium alloys alloyed with Gd and Ca

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