Effect of severe plastic deformation on an extruded ZK60 magnesium alloy

2016 ◽  
Vol 1818 ◽  
Author(s):  
Florina D. Dumitru ◽  
György Deák ◽  
Oscar F. Higuera-Cobos ◽  
José M. Cabrera-Marrero
Keyword(s):  
Magnesium Alloy ◽  
Tensile Tests ◽  
Equivalent Strain ◽  
Fiber Texture ◽  
Angular Pressing ◽  
Pyramidal Slip ◽  
Processed Material ◽  
Pole Figures ◽  
Zk60 Alloy ◽  
Zk60 Magnesium Alloy

ABSTRACTEqual channel angular pressing (ECAP) was carried out on extruded ZK60 magnesium alloy until an equivalent strain of ∼4 (corresponding to 4 passes) at 523K following route Bc. The effect of the deformation on both microstructure and texture was investigated by analysis of inverse pole figures and pole figures respectively, determined by EBSD. Additionaly, the mechanical properties were evaluated through tensile tests. The ECAPed processed ZK60 alloy showed the presence of dynamic recrystallization (DRX) process, correlated with a strong basal fiber texture. The presence of pyramidal slip was also observed, which can be correlated with the presence on twin-oriented boundaries in the material. Both the grain size reduction and the existence of texture influenced the ductility of the magnesium alloy processed by ECAP, as the ductility of the ZK60 alloy after four ECAP passes increased two times in comparation with the initial (un-processed) material.

Effect of Forward Extrusion and Heat Treatment on Microstructure and Mechanical Properties of as-Cast ZK60 Magnesium Alloy

2010 ◽  
Vol 148-149 ◽  
pp. 332-337 ◽  
Author(s):  
Yong Xue ◽  
Zhi Min Zhang ◽  
Li Hui Lang
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Tensile Strength ◽  
Magnesium Alloy ◽  
Tensile Tests ◽  
Extrusion Process ◽  
Extrusion Ratio ◽  
Forward Extrusion ◽  
Zk60 Alloy ◽  
Zk60 Magnesium Alloy

In the present research, the influences of different extrusion ratios (15, 30, 45, 60, and 75), extrusion temperatures (300 , 340 , 380 , 420 , and 460 ), and subsequent heat treatment on the mechanical properties and microstructure of as-cast ZK60 magnesium alloy have been investigated through the tensile tests and via metallographic observation. The results show that forward extrusion process can refine the microstructure of as-cast ZK60 alloy effectively. If as-cast ZK60 alloys have been extruded with the extrusion ratio 45 at 380 ,420 and 460 , respectively, and then post-heat treatment was conducted, the ZK60 alloy’s strength is higher under T5 than T6 treatment. For as-cast ZK60 alloy processed by extrusion and T5 method, the most appropriate temperature for extrusion processing is 300 , at which its tensile strength are highest provided the extrusion ratio is 30 but yet its plasticity is best provided the extrusion ratio is 45. If forward extrusions were conducted at 380 , mechanical properties of ZK60 alloy have little difference as the extrusion ratio varies. When T6 treatment was conducted for the extruded bars, their mechanical properties were improved little, moreover, the bigger the extrusion ratio is, the higher the tensile strength and elongation of the extruded bars become.

Smooth and notched fatigue performance of aging treated and shot peened ZK60 magnesium alloy

2010 ◽  
Vol 25 (7) ◽  
pp. 1375-1387 ◽  
Author(s):  
Wen-Cai Liu ◽  
Jie Dong ◽  
Ping Zhang ◽  
Xing-Wei Zheng ◽  
Wen-Jiang Ding ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Compressive Residual Stress ◽  
High Cycle Fatigue ◽  
Fatigue Performance ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Notched Specimen ◽  
Notched Specimens ◽  
Zk60 Alloy ◽  
Zk60 Magnesium Alloy

The influence of shot peening (SP) on high cycle fatigue (HCF) performance of smooth and notched specimens of hot-extruded ZK60 magnesium alloy was investigated and compared to that of hot-extruded and T5 aging-treated ZK60 magnesium alloy referred to as ZK60-T5. The increases in fatigue properties at the optimum Almen intensities were found to depend on the material states. In contrast to ZK60 alloy, higher smooth and notched fatigue properties for both unpeened and peened specimens were observed for ZK60-T5 alloy. Meanwhile, the improvement of fatigue life for notched specimen by SP was much more than that for the smooth specimen. The mechanism by which the compressive residual stress induced by SP resulted in the improvement of fatigue performance of smooth and notched specimens for ZK60 and ZK60-T5 alloys was discussed.

Microstructural and Calorimetric Analysis of ZK60 Alloy Processed by ECAP

2013 ◽  
Vol 682 ◽  
pp. 169-175
Author(s):  
Florina Diana Dumitru ◽  
Brandusa Ghiban ◽  
Jose María Cabrera ◽  
Oscar Fabián Higuera-Cobos ◽  
Gheorghe Gurau ◽  
...  
Keyword(s):  
Xrd Analysis ◽  
Recrystallization Temperature ◽  
Stored Energy ◽  
Structural Components ◽  
Scanning Calorimetry ◽  
Calorimetric Analysis ◽  
Angular Pressing ◽  
Zk60 Alloy ◽  
Zk60 Magnesium Alloy ◽  
Made In

In the last years many research efforts have been made in order to extend the application of wrought magnesium to structural components. One of the methods to improve the mechanical properties of the processed materials is through severe plastic deformation (SPD). ZK60 magnesium alloy samples were subjected to 6 passes of equal-channel angular pressing (ECAP) decreasing the temperature after the fourth pass, following an alternative route A. The structural characterization was realized by microstructural evolution using Oriented Image Microscopy (OIM) and XRD analysis. Differential Scanning Calorimetry (DSC) was used to estimate the stored energy and the recrystallization temperature after each ECAP pass.

SPF/DB Research in ZK60 Alloy with Gasification Agent as Pressurization Mediator

2007 ◽  
Vol 551-552 ◽  
pp. 241-244
Author(s):  
Yan Dong Yu ◽  
C.W. Wang ◽  
D.L. Yin
Keyword(s):  
Grain Size ◽  
Magnesium Alloy ◽  
Diffusion Bonding ◽  
Forming Process ◽  
Zk60 Alloy ◽  
Zk60 Magnesium Alloy

A new SPF/DB technology using gasification agent as pressurization mediator was proposed in this paper. The forming principle of SPF/DB using the agent was represented. Dies used for the forming process was designed and manufactured, and new gasification agent N11 which is white solid powder at normal temperature and it is easy to encapsulate and keep was developed for magnesium alloy. ZK60 magnesium alloy with a thickness of 1mm and grain size of 7.9μm was selected to conduct the experiment of SPF/DB. Corrugated ZK60 magnesium alloy parts were well formed under the temperature between 653K and 673K and forming time of 50 minutes. SEM was used to observe the microstructures of the diffusion bonding joints. The result shows that the joints were well bonded.

scholarly journals Improving mechanical properties of ZK60 magnesium alloy by cryogenic treatment before hot extrusion

2020 ◽  
Vol 39 (1) ◽  
pp. 200-208
Author(s):  
Tao Lin ◽  
Ji-Xue Zhou ◽  
Cai-Nian Jing ◽  
Yun-Teng Liu ◽  
Lin-Lin Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Magnesium Alloy ◽  
Grain Boundaries ◽  
Cryogenic Treatment ◽  
Hot Extrusion ◽  
Microstructure And Mechanical Properties ◽  
Zk60 Alloy ◽  
Nonferrous Alloys ◽  
Zk60 Magnesium Alloy

AbstractFew studies of cryogenic treatment were focused on nonferrous alloys, such as magnesium alloy. In this work, the effect of cryogenic treatment (77 K) before extrusion on microstructure and mechanical properties of ZK60 alloy was investigated. The results showed that many fine G.P. zones were formed during the cryogenic treatment and then grew to short fine {\beta }_{1}^{^{\prime} } precipitates when heating before extrusion. These precipitates pinned dynamic recrystallized grain boundaries in the subsequent extrusion, resulting in fine gains and dispersed spherical precipitates. By the cryogenic treatment before extrusion, the extruded ZK60 alloy showed good tensile strength and elongation balance. Especially, elongation was improved by 29%.

scholarly journals Dynamic Recrystallization and Grain Growth in a ZK60 Magnesium Alloy Sheet Produced by Isothermal Rolling

2004 ◽  
Vol 467-470 ◽  
pp. 1175-1180 ◽  
Author(s):  
Arthur Galiyev ◽  
Rustam Kaibyshev
Keyword(s):  
Magnesium Alloy ◽  
Dynamic Recrystallization ◽  
Grain Refinement ◽  
Grain Growth ◽  
Alloy Sheet ◽  
Ultrafine Grained ◽  
Zk60 Alloy ◽  
Higher Temperature ◽  
Superplastic Properties ◽  
Zk60 Magnesium Alloy

A ZK60 magnesium alloy was subjected to isothermal rolling (IR) at 275 and 300°C. This processing resulted in grain refinement through dynamic recrystallization (DRX) at both temperatures. The recrystallized volume fractions of 82 and 95% and average sizes of fine grains of 2.5 and 3.7 µm were achieved after IR at 275 and 300°C, respectively. It was shown that the ultrafine-grained structure produced by DRX at 300°C exhibited higher stability under following static and dynamic annealing than that produced at 275°C. This fact was attributed with the formation of a less constrained DRX structure at higher temperature of IR. As a result, the sheet produced from the ZK60 alloy at 300°C showed superior superplastic properties. Conversely, it was not feasible to enhance the superplastic properties in the ultrafine-grained alloy produced at 275°C because significant grain growth occurred during further processing of the as-rolled alloy.

Sign in / Sign up

Export Citation Format

Share Document