The Microstructure and Properties of Extruded Mg-Nd-Gd-Zn-Zr Alloy

2012 ◽  
Vol 554-556 ◽  
pp. 465-471
Author(s):  
Yong Dong Xu ◽  
Sheng Sun Hu ◽  
Jing Jiang Nie ◽  
Jun Wang ◽  
Rong Wang ◽  
...  
Keyword(s):  
Dislocation Density ◽  
Aging Process ◽  
Squeeze Casting ◽  
Aging Treatment ◽  
Hot Extrusion ◽  
Strength Increase ◽  
Secondary Phases ◽  
Dislocation Interaction ◽  
Microstructure And Properties ◽  
Zr Alloy

The extruded microstructure and properties of Mg-2.7Nd-1.2Gd-0.4Zn-0.3Zr alloy by squeeze casting were investigated. After aging process (T5), the dislocation density was enhanced and the dislocation interaction was increased; the factors of grain refinement, RE phases redistribution, the increment of dislocations and the interaction between dislocations and precipitate phases were contributed to the strength increase after hot extrusion and aging treatment, the fracture mode of the hot-extruded alloy was the fracture of the secondary phases and the trans-grain fracture.

The Study on Microstructures and Properties of the Direct Squeeze Casting Al-Zn-Mg-Cu-Zr-Sc Alloy

2013 ◽  
Vol 652-654 ◽  
pp. 2455-2459 ◽  
Author(s):  
Zhi Gang Wang ◽  
Jun Xu ◽  
Zhi Feng Zhang ◽  
Bao Li ◽  
Da Quan Li
Keyword(s):  
Mechanical Property ◽  
Trace Elements ◽  
Squeeze Casting ◽  
Gravity Casting ◽  
Microstructure And Properties ◽  
Probability Of Occurrence ◽  
Shrinkage Cavities ◽  
Defect Microstructures ◽  
Zr Alloy ◽  
Zr Alloys

Trace elements Sc was added to the Al-Zn-Mg-Cu-Zr alloys, the differences of the microstructure and properties using gravity casting and squeeze casting are compared. The result shows that through the addition of trace elements Sc, the Al-Zn-Mg-Cu-Zr alloys casting microstructure was refined effectively, dendrite segregation was alleviated and the mechanical property of alloy was enhanced. Using squeeze casting forming could improve the compactness of the alloys, decrease the probability of occurrence of shrinkage cavities, porosity and segregation, in addition, the grain could be refined by the pressure forced on the alloy melt. Combined the element Sc microalloying and squeeze casting used in Al-Zn-Mg-Cu-Zr alloy forming, we could get the casting with uniform, compact, little defect microstructures. This combination could provide a new way to the Al-Zn-Mg-Cu-Zr alloy forming.

Evolution of microstructure and properties of Al–Zn–Mg–Cu–Sc–Zr alloy during aging treatment

2016 ◽  
Vol 658 ◽  
pp. 946-951 ◽  
Author(s):  
Miao Zhang ◽  
Tao Liu ◽  
Chunnian He ◽  
Jian Ding ◽  
Enzuo Liu ◽  
...  
Keyword(s):  
Aging Treatment ◽  
Microstructure And Properties ◽  
Evolution Of Microstructure ◽  
Zr Alloy

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

Metals ◽  
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.

The Effect of Aging Heat Treatment on the Microstructure and Mechanical Properties of 10Cr20Ni25Mo1.5NbN Austenitic Steel

2016 ◽  
Vol 35 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Zhiyuan Liang ◽  
Wanhua Sha ◽  
Qinxin Zhao ◽  
Chongbin Wang ◽  
Jianyong Wang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Heat Treatment ◽  
Austenitic Steel ◽  
Treatment Time ◽  
Aging Treatment ◽  
Secondary Phases ◽  
Aging Heat Treatment ◽  
Microstructure And Mechanical Properties ◽  
The Impact

AbstractThe effect of aging heat treatment on the microstructure and mechanical properties of 10Cr20Ni25Mo1.5NbN austenitic steel was investigated in this article. The microstructure was characterized by scanning electron microscopy, energy dispersive spectrometry and transmission electron microscopy. Results show that the microstructure of 10Cr20Ni25Mo1.5NbN austenitic is composed of austenite. This steel was strengthened by precipitates of secondary phases that were mainly M23C6 carbides and NbCrN nitrides. As aging treatment time increased, the tensile strength first rose (0–3,000 h) and then fell (3,000–5,000 h) due to the decrease of high density of dislocations. The impact absorbed energy decreased sharply, causing the sulfides to precipitate at the grain boundary. Therefore, the content of sulfur should be strictly controlled in the steelmaking process.

Microstructure and properties of Cu-Cr-Zr alloy with columnar crystal structure processed by upward continuous casting

2022 ◽  
Vol 889 ◽  
pp. 161700
Author(s):  
Jinshui Chen ◽  
Xiangpeng Xiao ◽  
Dawei Yuan ◽  
Chengjun Guo ◽  
Hao Huang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Continuous Casting ◽  
Columnar Crystal ◽  
Microstructure And Properties ◽  
Zr Alloy

scholarly journals Microstructure and properties of Cu–Ni–Si–Zr alloy after thermomechanical treatments

Rare Metals ◽  
2013 ◽  
Vol 32 (2) ◽  
pp. 144-149 ◽  
Author(s):  
Xiang-Peng Xiao ◽  
Bai-Qing Xiong ◽  
Qiang-Song Wang ◽  
Guo-Liang Xie ◽  
Li-Jun Peng ◽  
...  
Keyword(s):  
Microstructure And Properties ◽  
Zr Alloy

Superplastic Behavior of a Cu-Cr-Zr Alloy Subjected to ECAP

2016 ◽  
Vol 838-839 ◽  
pp. 404-409
Author(s):  
Roman Mishnev ◽  
Iaroslava Shakhova ◽  
Andrey Belyakov ◽  
Rustam Kaibyshev
Keyword(s):  
Grain Size ◽  
Dislocation Density ◽  
Strain Rate ◽  
Temperature Interval ◽  
Rate Sensitivity ◽  
Tensile Tests ◽  
Superplastic Behavior ◽  
Average Grain Size ◽  
Gauge Section ◽  
Zr Alloy

A Cu-0.87%Cr-0.06%Zr alloy was subjected to equal channel angular pressing (ECAP) at a temperature of 400 °C up to a total strain of ~ 12. This processing produced ultra-fine grained (UFG) structure with an average grain size of 0.6 μm and an average dislocation density of ~4×1014 m-2. Tensile tests were carried out in the temperature interval 450 – 650 °C at strain rates ranging from 2.8´10-4 to 0.55 s-1. The alloy exhibits superplastic behavior in the temperature interval 550 – 600 °C at strain rate over 5.5´10-3 s-1. The highest elongation-to-failure of ~300% was obtained at a temperature of 575 °C and a strain rate of 2.8´10-3 s-1 with the corresponding strain rate sensitivity of 0.32. It was shown the superplastic flow at the optimum conditions leads to limited grain growth in the gauge section. The grain size increases from 0.6 μm to 0.87 μm after testing, while dislocation density decreases insignificantly to ~1014 m-2.

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