Microstructural evolution of previously deformed ZA27 alloy during partial remelting

Chen, T.J; Yuan, Hao; Sun, Jun

doi:10.1016/s0921-5093(02)00018-7

Cited by 68 publications

(34 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This non-dendritic microstructure exhibits thixotropic behavior, which allows the alloy to be handled as a solid when at rest and attains fluid-like properties when sheared during the forming operation [5]. Therefore, the majority effort of semi-solid processing is focused on the generation of non-dendritic microstructure [6][7][8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…As a result, it is important to study how the processing parameters affect the microstructure evolution in the semi-solid state. Results on microstructure evolution of AZ91D magnesium alloy have already been published during SIMA process [11][12][13][14][15][16]. However, the information is not directly useful from the perspective of semisolid processing: the isothermal holding times were extended to the order of hours while during semi-solid processing, the times for reheating are less than 10-15 min.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of processing parameters on the microstructure of ECAE-formed AZ91D magnesium alloy in the semi-solid state

Luo

Chen

Zhao

2009

Journal of Alloys and Compounds

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of processing parameters on the microstructure of ECAE-formed AZ91D magnesium alloy in the semi-solid state

Luo

Chen

Zhao

2009

Journal of Alloys and Compounds

View full text Add to dashboard Cite

“…L þ a 0 and a 0 ! L during this stage (0 -30 min) [4], resulting in the rapid increase of the liquid fraction (Fig. 6), which corresponds to the decrease in the particle size of these two alloys observed in Fig.…”

Section: Metallographic Observationsmentioning

confidence: 74%

Effects of Mg and RE additions on the semi-solid microstructure of a zinc alloy ZA27

Chen

Yuan

Sun

et al. 2003

Science and Technology of Advanced Materials

View full text Add to dashboard Cite

The effects of 2 mass% Mg and 0.8 mass% RE additions on the microstructural evolution of a Zr modified zinc alloy ZA27 during isothermal holding at semi-solid temperature of 460 8C have been studied by optical microscope and scanning electron microscope. Results show that these two elements all decrease the coarsening rate of solid primary particles, and improve the uniformity of particle size. The addition of Mg greatly decreases the solid fraction, and then increases the distance between particles. However, the element of RE mainly concentrates at the liquid regions between particles, and hinders both the atom diffusion and the welding of contact particles. In addition, the behaviors of particle coarsening of these two alloys, together with that of the Zr modified ZA27 alloy without the other elements, obey the LSW law after the three semi-solid systems reach at their solid-liquid equilibrium states. The additions of these two elements have no visible effect on the shape factor of particles. q

show abstract

“…The main goal in the semi-solid forming processes is to achieve a thixotropic microstructure consisting of fine and spherical solid grains which are uniformly distributed in the liquid matrix [6,7]. Various routes have been developed for production of thixotropic aluminum, magnesium, lead, and also ferrous alloys including mechanical and magneto-hydrodynamic (MHD) stirring processes, the thermo-mechanical strain induced melt activation (SIMA) process and the spray casting process [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Phase Evolution and Mechanical Behavior of the Semi-Solid SIMA Processed 7075 Aluminum Alloy

Binesh

Aghaie-Khafri

2016

Metals

View full text Add to dashboard Cite

Microstructural and mechanical behaviors of semi-solid 7075 aluminum alloy were investigated during semi-solid processing. The strain induced melt activation (SIMA) process consisted of applying uniaxial compression strain at ambient temperature and subsequent semi-solid treatment at 600-620˝C for 5-35 min. Microstructures were characterized by scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). During the isothermal heating, intermetallic precipitates were gradually dissolved through the phase transformations of α-Al + η (MgZn 2 ) Ñ liquid phase (L) and then α-Al + Al 2 CuMg (S) + Mg 2 Si Ñ liquid phase (L). However, Fe-rich precipitates appeared mainly as square particles at the grain boundaries at low heating temperatures. Cu and Si were enriched at the grain boundaries during the isothermal treatment while a significant depletion of Mg was also observed at the grain boundaries. The mechanical behavior of different SIMA processed samples in the semi-solid state were investigated by means of hot compression tests. The results indicated that the SIMA processed sample with near equiaxed microstructure exhibits the highest flow resistance during thixoforming which significantly decreases in the case of samples with globular microstructures. This was justified based on the governing deformation mechanisms for different thixoformed microstructures.

show abstract

Microstructural evolution of previously deformed ZA27 alloy during partial remelting

Cited by 68 publications

References 23 publications

Effects of processing parameters on the microstructure of ECAE-formed AZ91D magnesium alloy in the semi-solid state

Effects of processing parameters on the microstructure of ECAE-formed AZ91D magnesium alloy in the semi-solid state

Effects of Mg and RE additions on the semi-solid microstructure of a zinc alloy ZA27

Phase Evolution and Mechanical Behavior of the Semi-Solid SIMA Processed 7075 Aluminum Alloy

Contact Info

Product

Resources

About