Compression Deformation Behavior of AZ91D Magnesium Alloy in Semi-Solid State

2007 ◽  
Vol 546-549 ◽  
pp. 151-154
Author(s):  
Ming Bo Yang ◽  
Fu Sheng Pan ◽  
Li Wen Tang ◽  
Hong Jun Hu
Keyword(s):  
Deformation Behavior ◽  
Deformation Rate ◽  
Deformation Temperature ◽  
Dendritic Structure ◽  
Isothermal Treatment ◽  
Compression Stress ◽  
Compression Strain ◽  
Compression Deformation ◽  
Maximum Compression Stress ◽  
Semi Solid

The semi-solid compression deformation behavior of the AZ91D alloy with non-dendritic structure, which was obtained under the semi-solid isothermal treatment condition of 570°C×60min, was studied by means of Gleeble-1500 thermal-mechanical simulator. When the compression strain was lower than 0.7, along with the compression strain increasing, the compression stress firstly increased rapidly, then decreased rapidly, and finally kept a constant stress level gradually. Under the condition of different deformation temperatures and deformation rates, the maximum compression stress was obtained simultaneously when the compression strain value was 0.025 approximatively. Furthermore, when the deformation rate kept a constant, the compression stress decreased along with the deformation temperature increasing, and when the deformation temperature kept a constant, the compression stress increased along with the deformation rate increasing.

Investigation on Zener-Hollomon Parameter in the Hot Compressive Deformation Behavior of SWRCH 35K

2013 ◽  
Vol 753-755 ◽  
pp. 241-244
Author(s):  
Peng Tian ◽  
Zhi Yong Zhong ◽  
Wei Jun Hui ◽  
Rui Guo Bai ◽  
Xing Li Zhang ◽  
...  
Keyword(s):  
Activation Energy ◽  
Strain Rate ◽  
Deformation Behavior ◽  
Deformation Rate ◽  
Deformation Temperature ◽  
Compressive Deformation ◽  
Stored Energy ◽  
Hollomon Parameter ◽  
Deformation Activation Energy ◽  
Quadratic Fitting

The hot compressive deformation behavior of SWRCH 35K was studied with uniaxial hot compression simulation tests at 923 ~ 1223 K and strain rate of 0.01 ~ 20 /s. The results show that the hot compressive deformation activation energy was 408 kJ/mol and the rang of deformation stored energy was 10 ~ 50 J/mol. The quadratic fitting expression between deformation stored energy and Zener-Hollomon parameter (Z) was established and the deformation stored energy was considered to increased with increasing Z or with lower deformation temperature and increasing deformation rate.

Hot Compression Deformation Behavior of Spray-Formed AlSn20Cu Alloy

2021 ◽  
Vol 1035 ◽  
pp. 189-197
Author(s):  
Bao Ying Li ◽  
Bao Hong Zhu
Keyword(s):  
Constitutive Equation ◽  
Strain Rate ◽  
Deformation Behavior ◽  
Deformation Temperature ◽  
Phase Distribution ◽  
True Stress ◽  
Hot Compression ◽  
Test Machine ◽  
Hot Compression Deformation ◽  
Compression Deformation

The hot deformation behavior of spray-formed AlSn20Cu alloy during hot compression deformation was studied, and the constitutive equation of AlSn20Cu alloy was established. The samples of spray-formed AlSn20Cu alloy were compressed on Gleeble-3500 thermal simulation test machine. The error of the true stress caused by adiabatic heating effect in the experiment was corrected. The constitutive equation of spray-formed AlSn20Cu alloy could be represented by Zener-Hollomon parameter in a hyperbolic sine function. The results showed that the deformation temperatures and strain rates had a notable effect on the true stress of the alloy. At the identical deformation temperature, the true stress increased with the increase of strain rate. When the strain rate was constant, the stress decreased with the increase of deformation temperature. After hot compression deformation, the tin phase was elongated along the direction perpendicular to the compression axis with short strips and blocks. With the increase of deformation temperature and the decrease of strain rate, Sn phase distribution became more homogeneous.

Effect of Direct Current on the Semi-Solid Isothermal Heat-Treated Microstructure of ZA84 Magnesium Alloy

2011 ◽  
Vol 189-193 ◽  
pp. 871-875
Author(s):  
Ming Bo Yang ◽  
Xiao Feng Liang ◽  
Yi Zhu
Keyword(s):  
Direct Current ◽  
Current Density ◽  
Dendritic Structure ◽  
Isothermal Treatment ◽  
Structure Evolution ◽  
Dendritic Microstructure ◽  
Experimental Conditions ◽  
Isothermal Temperature ◽  
Heat Treated ◽  
Semi Solid

The effect of direct current on the semi-solid isothermal heat-treated microstructure of ZA84 alloy is investigated. The results indicate that it is possible to produce ZA84 alloy with non-dendritic microstructure by semi-solid isothermal treatment. Furthermore, imposing direct current during the semi-solid isothermal treatment of ZA84 alloy can accelerate the non-dendritic structure evolution of the alloy. Under the experimental conditions of this work, higher the current density, quicker is the rate of non-dendritic structure evolution for the semi-solid isothermal heat-treated ZA84 alloy. Further investigations need to be considered in order to optimize the current density, isothermal temperature and holding time.

Constitutive Equation of ZL201 Alloy during the Semi-Solid Thixotropic Compression

2011 ◽  
Vol 418-420 ◽  
pp. 1274-1278
Author(s):  
Shu Zhen Shang ◽  
Xiao Ling Tang ◽  
Gui Min Lu ◽  
Wan Ning Zhang ◽  
Jiao Jiao Wang
Keyword(s):  
Experimental Data ◽  
Flow Stress ◽  
Constitutive Equation ◽  
Strain Rate ◽  
Deformation Behavior ◽  
Deformation Temperature ◽  
Processing Parameters ◽  
Experimental Results ◽  
Semi Solid ◽  
The Relationship

Effects of deformation temperature and strain rate on deformation behavior of semi-solid ZL201 alloy were investigated on Gleeble3800 thermal-mechanical simulator. On basis of the experimental data of semi-solid ZL201, a model of was established to describe the relationship between the processing parameters and flow stress, which showed that the experimental results and calculation ones fitted well. The suitable conditions of this model for semi-solid ZL201 alloy were that the temperature range was 547°C-649°C and that of the strain rate was 0.1 s-1-5s-1.

Deformation Behavior of Semi-Solid ZCuSn10P1 Copper Alloy during Isothermal Compression

2016 ◽  
Vol 256 ◽  
pp. 31-38
Author(s):  
Jia Wang ◽  
Rong Feng Zhou ◽  
Han Xiao ◽  
De Hong Lu ◽  
Lu Li ◽  
...  
Keyword(s):  
Strain Rate ◽  
Deformation Behavior ◽  
Deformation Temperature ◽  
Copper Alloy ◽  
Deformation Resistance ◽  
Experimental Results ◽  
Isothermal Compression ◽  
Compression Tests ◽  
Sima Process ◽  
Semi Solid

The isothermal compression tests of semi-solid ZCuSn10P1 alloy by strain induced melt activation (SIMA) process are carried out by Gleeble-1500 thermo-mechanical simulator, and the same tests are finished to samples of as-cast ZCuSn10P1 alloy. The deformation temperature respectively is 910°C, 920°C and 930°C, and the strain respectively is 0.4 and 0.6, the strain rate is 0.5s-1, 1s-1 and 10s-1. The experimental results indicate that the deformation resistance of semi-solid ZCuSn10P1 copper alloy with smaller, more uniform and rounder solid grain is about half of the as-cast ZCuSn10P1 copper alloy. The deformation resistance of ZCuSn10P1 alloy by SIMA process decreases with the deformation temperature increasing, and the deformation resistance increases with the strain rate increasing.

scholarly journals Compression Deformation Behavior of AZ81 Magnesium Alloy at Elevated Temperatures

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Xiaoping Luo ◽  
Shue Dang ◽  
Li Kang
Keyword(s):  
Activation Energy ◽  
Flow Stress ◽  
Magnesium Alloy ◽  
Strain Rate ◽  
Hot Deformation ◽  
Deformation Behavior ◽  
Deformation Temperature ◽  
Elevated Temperatures ◽  
Compression Deformation ◽  
Deformation Activation Energy

The hot deformation behavior of an AZ81 magnesium alloy was investigated by hot compressive testing on a Gleeble-1500 thermal mechanical simulator in the temperature range from 200 to 400°C and in the strain rate range of 0.001–5 s−1. The relationships among flow stress, strain rate, and deformation temperature were analyzed, and the deformation activation energy and stress exponent were calculated. The microstructure evolution of the AZ81 magnesium alloy under high deformation was examined. The results indicated that the maximum value of the flow stress increased with the decrease of deformation temperature and the increase of strain rate. When the deformation temperature is constant, the flow stress of the AZ81 magnesium alloy increases with the increase of strain rate, which can be demonstrated by a Zener-Hollomon parameter in a hyperbolic-sine-type equation with a hot compression deformation activation energy of 176.01 KJ/mol and basic hot deformation material factorsA,n, andain the analytical expression of the AZ81 magnesium alloy flow stress of3.21227×1014 s−1, 7.85, and 0.00866 MPa, respectively.

Microstructure Evolution of Hypereutectic Al-Si Alloy in Semi-Solid Compression Deformation

2013 ◽  
Vol 842 ◽  
pp. 122-129
Author(s):  
Yun Tao Wang ◽  
Xiao Guang Yuan ◽  
Bao Yi Yu ◽  
Hong Jun Huang
Keyword(s):  
Plastic Deformation ◽  
Strain Rate ◽  
Microstructure Evolution ◽  
Deformation Temperature ◽  
Sensitive Material ◽  
Positive Strain ◽  
Compression Deformation ◽  
Lower Strain ◽  
Fabrication Procedure ◽  
Semi Solid

The semi-solid microstructure evolution of hypereutectic Al-20Si-3Fe-1Mn-4Cu-1Mg alloy was studied by unidirectional compression deformation experiment, at a range of deformation temperature of 833K~873K and a range of strain rate of 0.1s-1~0.001s-1. The results showed that the microstructure of the reheating alloy was more spherical and fine than the microstructure of as-cast, the alloy was a positive strain rate sensitive material that the flow stress was decreased with increasing in deformation temperature and it was increased with increasing in strain rate. The mechanical properties of the alloy were hardly improved when the deformation temperature was too high to fracture the thick phase of the alloy.The lower strain rate was not only reducing the productivity but also reducing the plastic deformation. The microstructure of the alloy which the thick phase was broken fundamentally and the grain became further refinement can be obtained at 833K~853K, and at 0.1s-1~0.01s-1.It can be done that reducing the plastic deformation resistance and strengthening the fabrication procedure of the alloy.

Sign in / Sign up

Export Citation Format

Share Document