Hot deformation behavior of ZrTiAlV alloy with a coarse grain structure in the β phase field

2013 ◽  
Vol 577 ◽  
pp. 218-224 ◽  
Author(s):  
Y.B. Tan ◽  
L.H. Yang ◽  
C. Tian ◽  
R.P. Liu ◽  
X.Y. Zhang ◽  
...  
Keyword(s):  
Phase Field ◽  
Hot Deformation ◽  
Deformation Behavior ◽  
Grain Structure ◽  
Coarse Grain ◽  
Hot Deformation Behavior ◽  
Β Phase

Hot Deformation Behavior and Microstructure Evolution of Ti-6.5Al-1.5Zr-3.5Mo-0.3Si with an Equiaxed α+β Starting Structure

2007 ◽  
Vol 546-549 ◽  
pp. 1383-1388 ◽  
Author(s):  
Hui Qin Chen ◽  
Hao Zhuan Lin ◽  
L. Guo ◽  
Chun Xiao Cao
Keyword(s):  
Activation Energy ◽  
Apparent Activation Energy ◽  
Phase Field ◽  
Hot Deformation ◽  
Deformation Behavior ◽  
Hot Deformation Behavior ◽  
Temperature Range ◽  
Self Diffusion ◽  
Β Phase ◽  
Plastic Deformation Behavior

The hot deformation behavior of TC11 with an equiaxed α+β pre-form microstructure was investigated by hot compression tests in the temperature range 800°C–1090°C and strain rate range 1×10-310s-1. Several approaches have been used in this investigation, which include analysis of shapes of stress–strain curves, kinetic analysis and microstructure observation. The experimented results showed that, (1) In the β phase field, the alloy exhibits dynamic re-crystallization. The apparent activation energy in this domain is estimated to be 183kJ/ mol, which is close to that for self-diffusion in β. The re-crystallized grain size may be governed by competing of diffusion and dynamic re-crystallization rate at deforming conditions. (2) In the α+β phase field, the alloy exhibits super-plastic deformation behavior at 0.001-0.01s-1 and 980°C -850°C, and the apparent activation energy estimated in this domain is about 600 kJ/mol, which is much higher than that for self-diffusion in α-titanium due to β volume fraction is not constant over the test temperature range.

Hot deformation behavior of Ti–20Zr–6.5Al–4V alloy in the α+β and single β phase field

2014 ◽  
Vol 609 ◽  
pp. 226-234 ◽  
Author(s):  
Y.B. Tan ◽  
J.L. Duan ◽  
L.H. Yang ◽  
W.C. Liu ◽  
J.W. Zhang ◽  
...  
Keyword(s):  
Phase Field ◽  
Hot Deformation ◽  
Deformation Behavior ◽  
Hot Deformation Behavior ◽  
Β Phase

scholarly journals Hot deformation behavior of 51.1Zr–40.2Ti–4.5Al–4.2V alloy in the single β phase field

2015 ◽  
Vol 25 (1) ◽  
pp. 34-41 ◽  
Author(s):  
Jingli Duan ◽  
Yuanbiao Tan ◽  
Liyuan Ji ◽  
Wenchang Liu ◽  
Jingwu Zhang ◽  
...  
Keyword(s):  
Phase Field ◽  
Hot Deformation ◽  
Deformation Behavior ◽  
Hot Deformation Behavior ◽  
Β Phase

scholarly journals Microstructure and Hot Deformation Behavior of Twin Roll Cast Mg-2Zn-1Al-0.3Ca Alloy

Materials ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1020 ◽  
Author(s):  
Kristina Kittner ◽  
Madlen Ullmann ◽  
Thorsten Henseler ◽  
Rudolf Kawalla ◽  
Ulrich Prahl
Keyword(s):  
Hot Deformation ◽  
Deformation Behavior ◽  
Flow Instability ◽  
Grain Structure ◽  
Strain Rates ◽  
Compression Tests ◽  
Cast State ◽  
Hot Deformation Behavior ◽  
Twin Roll Cast ◽  
Twin Roll

In the present work, the microstructure, texture, mechanical properties as well as hot deformation behavior of a Mg-2Zn-1Al-0.3Ca sheet manufactured by twin roll casting were investigated. The twin roll cast state reveals a dendritic microstructure with intermetallic compounds predominantly located in the interdendritic areas. The twin roll cast samples were annealed at 420 °C for 2 h followed by plane strain compression tests in order to study the hardening and softening behavior. Annealing treatment leads to the formation of a grain structure, consisting of equiaxed grains with an average diameter of approximately 19 µm. The twin roll cast state reveals a typical basal texture and the annealed state shows a weakened texture, by spreading basal poles along the transverse direction. The twin roll cast Mg-2Zn-1Al-0.3Ca alloy offers a good ultimate tensile strength of 240 MPa. The course of the flow curves indicate that dynamic recrystallization occurs during hot deformation. For the validity range from 250 °C to 450 °C as well as equivalent logarithmic strain rates from 0.01 s−1 to 10 s−1 calculated model coefficients are shown. The average activation energy for plastic flow of the twin roll cast and annealed Mg-2Zn-1Al-0.3Ca alloy amounts to 180.5 kJ/mol. The processing map reveals one domain with flow instability at temperatures above 370 °C and strain rates ranging from 3 s−1 to 10 s−1. Under these forming conditions, intergranular cracks arose and grew along the grain boundaries.

scholarly journals Comparative Study of Hot Deformation Behavior and Microstructure Evolution of As-Cast and Extruded WE43 Magnesium Alloy

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 429
Author(s):  
Yuehua Kang ◽  
Zhenghua Huang ◽  
Hu Zhao ◽  
Chunlei Gan ◽  
Nan Zhou ◽  
...  
Keyword(s):  
Strain Rate ◽  
Microstructure Evolution ◽  
Hot Deformation ◽  
Deformation Behavior ◽  
True Strain ◽  
Fiber Texture ◽  
Grain Structure ◽  
Hot Deformation Behavior ◽  
Fine Grain ◽  
We43 Alloy

Under compressive testing at 400 °C and a strain rate range of 0.05–5 s−1, the hot deformation behavior and microstructure evolution of an as-cast (AC), as-extruded (with a bimodal grain structure (named as Ex-1) or a relatively uniform fine grain structure (Ex-2)) WE43 alloy have been investigated and compared. The results indicate that the AC sample exhibits the highest peak stress, while the Ex-2 sample has the lowest value. Within the AC material, fine grains were firstly formed along the pancake-like deformed grains (as a necklace structure). The necklace structure was also formed within the Ex-1 and Ex-2 materials at high strain rates of 0.5 and 5 s−1. However, a lamellar structure that the coarse elongated grains divided by parallel boundaries was formed within the Ex-1 material. A relatively more homogeneous fine grain structure is achieved after a true strain of 1.0 within the Ex-2 material at a low strain rate of 0.05 s−1. In addition, a discontinuous dynamic recrystallization mechanism by grain boundary bulging is found to occur. After a true strain of 1.2, a (0001) fiber texture, a typical rare earth (RE) texture, and a relatively random texture are formed within the AC, Ex-1, and Ex-2 WE43 alloy material, respectively.

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