Inhomogeneous yielding and work hardening of a fine grained Al–Mg alloy

2013 ◽  
Vol 585 ◽  
pp. 455-459 ◽  
Author(s):  
D.J. Lloyd ◽  
H. Jin
Keyword(s):  
Work Hardening ◽  
Mg Alloy ◽  
Fine Grained

Evolutions of Microstructure for Multilayered Al-Mg Alloy Composites by Accumulation Roll Bonding (ARB) Process

2011 ◽  
Vol 411 ◽  
pp. 527-531
Author(s):  
Bing Zhang ◽  
Zhong Wei Chen ◽  
Shou Qian Yuan ◽  
Tian Li Zhao
Keyword(s):  
Multilayer Structure ◽  
Optical Microscope ◽  
Alloy Layer ◽  
Mg Alloy ◽  
Micro Hardness ◽  
Roll Bonding ◽  
Fine Grained ◽  
Hardness Tester ◽  
Average Grain Size ◽  
Evolution Of Microstructure

In this paper, accumulative roll bonding (ARB) has been used to prepare the Al/Mg alloy multilayer structure composite materials with 1060Al sheet and MB2 sheet. The evolution of microstructure of the cladding materials during ARB processes was observed by optical microscope, scanning electron microscopy, and micro-hardness was measured by micro-hardness tester. The results show that a multilayer structure material of Al/Mg alloy with excellent bonding characteristics and fine grained microstructure was prepared by ARB processes. With the ARB cycles increasing, Mg alloy layer in multilayer composite material was necked and fractured, and the hardness of the Al and Mg alloy was increased. Average grain size was less than 1μm after ARB4 cycles.

Improving the Mechanical Properties of AZ31 Mg Alloy by High Ratio Extrusion

2006 ◽  
Vol 503-504 ◽  
pp. 865-870 ◽  
Author(s):  
Yongjun Chen ◽  
Qu Dong Wang ◽  
Jianguo Peng ◽  
Chun Quan Zhai
Keyword(s):  
Mechanical Properties ◽  
High Strength ◽  
High Ratio ◽  
Extrusion Ratio ◽  
Mg Alloy ◽  
Fine Grained ◽  
Az31 Mg Alloy ◽  
Industry Applications ◽  
One Step ◽  
The One

Experiments were conducted both to evaluate the potential for grain refinement, the subsequent mechanical properties at room temperature in samples of AZ31 Mg alloy and also to investigate the relationship between one-step and two-step high ratio extrusion (HRE). The one-step HRE was undertaken using a high extrusion ratio of 70:1 at 250, 300 and 350°C. And the two-step HRE was conducted with an extrusion ratio of 7 for the first step at 250, 300 and 350°C, followed by a second-step extrusion with an extrusion ratio of 10 at 250, 300 and 350°C. The initial grain size in the AZ31 ingot was 100μm and that after one-step HRE became similar to 5μm, after two-step HRE at 250, 300 and 350°C were 2, 4, 7μm, respectively, resulting in superior mechanical properties at ambient temperature. The microstructure of two-step HRE was finer and uniformer than that of one-step HRE and the strength of one-step and two-step HRE were similar, moreover, the elongation of one-step HRE was improved markedly than that of two-step HRE. Dynamic recrystallization and adjacent grain broking during HRE is introduced to explain the effects of one-step and two-step HRE on the microstructure and mechanical properties of AZ31 Mg alloy. The current results imply that the simple HRE method might be a feasible processing method for industry applications, and the multiply steps extrusion are effective to fabricate high strength of fine grained hcp metals.

Effect of pressurization profile on the deformation characteristics of fine-grained AZ31B Mg alloy sheet during gas blow forming

2010 ◽  
Vol 210 (12) ◽  
pp. 1673-1679 ◽  
Author(s):  
Pin-Hou Sun ◽  
Horng-Yu Wu ◽  
Hsin-Han Tsai ◽  
Chih-Chao Huang ◽  
Ming-Da Tzou
Keyword(s):  
Alloy Sheet ◽  
Mg Alloy ◽  
Deformation Characteristics ◽  
Fine Grained

Effects of changes in strain path on work-hardening in CP aluminium and an AlCuMg alloy

1990 ◽  
Vol 38 (2) ◽  
pp. 215-226 ◽  
Author(s):  
D.V. Wilson ◽  
M. Zandrahimi ◽  
W.T. Roberts
Keyword(s):  
Work Hardening ◽  
Strain Path ◽  
Mg Alloy

Strength and Formability of Fine-Grained Laminated Magnesium Alloy

2013 ◽  
Vol 753 ◽  
pp. 465-468
Author(s):  
Masafumi Noda ◽  
Kunio Funami
Keyword(s):  
Fracture Toughness ◽  
Magnesium Alloy ◽  
Grain Refinement ◽  
Surface Properties ◽  
Laminated Composite ◽  
Mg Alloy ◽  
Roll Bonding ◽  
Fine Grained ◽  
Solid Diffusion ◽  
Laminated Material

The development of laminated composite Mg alloy sheets, prepared by solid diffusion and roll bonding, is an effective way of improving the stiffness and surface properties of these materials while retaining their lightness. Laminated composites consisting of a core of Mg alloy between sheets of A5083 alloy as the coating material with Ti foil interlayers were prepared by solid diffusion and roll bonding. The laminated material had a strength and was resistant to cracking during deformation. Compounds that were formed and dispersed at the bonding interface between the Al and Mg alloys subjected to grain refinement improved the fracture toughness and strength of the composites, and it was important that these compounds were formed discontinuously. The fracture toughness of the laminated composite was twice that of the base Mg alloy, and its Young's modulus was 57 GPa.

Machining characteristics of fine grained AZ91 Mg alloy processed by friction stir processing

2017 ◽  
Vol 27 (4) ◽  
pp. 804-811 ◽  
Author(s):  
G.V.V. SURYA KIRAN ◽  
K. HARI KRISHNA ◽  
Sk. SAMEER ◽  
M. BHARGAVI ◽  
B. SANTOSH KUMAR ◽  
...  
Keyword(s):  
Friction Stir Processing ◽  
Mg Alloy ◽  
Friction Stir ◽  
Fine Grained ◽  
Machining Characteristics

Nano-Precipitated Phase and Evolution of Al-Cu-Mg Alloy Subjected to Rapid Cold Stamping

2019 ◽  
Vol 11 (9) ◽  
pp. 1318-1326
Author(s):  
Caihe Fan ◽  
Ling Ou ◽  
Jianjun Yang ◽  
Xihong Chen
Keyword(s):  
Boundary Diffusion ◽  
Hardness Test ◽  
S Phase ◽  
Mg Alloy ◽  
Fine Grained ◽  
Precipitated Phase ◽  
Transmission Electron ◽  
Three Stages ◽  
Cold Stamping ◽  
Precipitation Phase

High-resolution transmission electron microscopy, energy dispersive spectroscopy, and hardness test were used to study the nano-precipitates and evolution of nano-precipitation of the sprayformed fine-grained Al-Cu-Mg alloy during rapid cold stamping deformation. Results show that the elongated S-phase and the acicular ' phase of the Al-Cu-Mg alloy after three passes of cold stamping of rapid cold-shock deformation undergoes re-dissolution, and a large number of the fine granular balance  phases are precipitated after four passes of rapid cold-stamping deformation. The main mechanism of low-temperature re-dissolution of S' phase and ' phase in Al-Cu-Mg alloy induced by rapid cold stamping deformation is the precipitation phase fracture, grain boundary diffusion, and vacancy diffusion. The change in the hardness of the alloy during rapid cold stamping deformation is affected by the combination of phase-resolving softening, work hardening, and reprecipitation strengthening and increases at three stages. The hardness increases from 55 HB to 125 HB, which is increased by 127%.

Press Forming Technology Using Superplastic Deformation for Mg Alloy Sheet

2005 ◽  
Vol 488-489 ◽  
pp. 571-574 ◽  
Author(s):  
Hiroyuki Fujii ◽  
Hajime Iwasaki ◽  
Jacky Kazuo Araki
Keyword(s):  
High Strain ◽  
Hydraulic Press ◽  
Alloy Sheet ◽  
Mg Alloy ◽  
Rolled Sheet ◽  
Blank Holder ◽  
Fine Grained ◽  
Forming Technology ◽  
Az31 Mg Alloy ◽  
Cylindrical Cup

The square-cylindrical cup of AZ31 Mg alloy with a depth of 50mm and a width of 50 mm was successfully deep drawn from a rolled sheet with a thickness of 0.5 mm using a hydraulic press machine with a capacity of 60 tons. The blank was heated between the die and the blank holder kept in a temperature of 300 oC .The forming time was about 3 seconds. The fine-grained microstructure was observed at the corner with a sever strain. The grain refinement caused by the dynamic recrystallization contributed to generate high strain-rate superplasticity.

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