Microstructural evolution and high temperature flow behaviors of a homogenized Sr-modified Al-Si-Mg alloy

Lin, Y.C.; Luo, Shuncun; Yin, Liang‐Xing; Huang, Jian

doi:10.1016/j.jallcom.2017.12.278

Cited by 62 publications

(24 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The flow softening is attributed to microstructural softening, consisting of dynamic recovery, dynamic recrystallization, dynamic precipitation. 24,25) According to the results of Fig. 6 and Fig.…”

Section: Discussionmentioning

confidence: 99%

“…In the past several decades, the hot forming behaviors based on flow softening, microstructure evolution and processing map have been researched for optimizing work parameters. 25) It is generally known that the flow softening behavior is related to the thermal softening and microstructural softening, which are considered to be originated by many factors: deformation heating, strain rate, strain localization, the extent of dynamic recrystallization. 68) Researches in 6063, 7020 and AlMg alloy have found the deformation heating can give rise to flow softening due to the increase in temperature.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Flow Softening Behavior and Deformation Mechanism of AA7050 Aluminum Alloy

Yang

Liu

et al. 2019

Mater. Trans.

View full text Add to dashboard Cite

The flow softening behavior and deformation mechanism of AA7050 aluminium alloy are investigated though hot compressive tests using a Gleebe-1500 thermal simulator at strain rates of 0.01³10 s ¹1 and temperatures of 300³450°C. The results show that the maximal relative softening transforms from 350°C to 450°C with increasing strain rate. Based on the processing maps and microstructure characterizations, dynamic recovery, dynamic precipitation and coarsening may be responsible for the softening behavior of AA7050 aluminium alloy at 350°C and 0.01 s ¹1. With increasing strain rate and temperature, high level of the flow softening is associated with deformation heating, dynamic recovery and dynamic recrystallization. The superimposed processing map with various strains is established, indicating that the optimum hot workability domain is the temperature range of 390³450°C and strain rate range of 0.1³0.01 s ¹1 .

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Flow Softening Behavior and Deformation Mechanism of AA7050 Aluminum Alloy

Yang

Liu

et al. 2019

Mater. Trans.

View full text Add to dashboard Cite

show abstract

“…With continue of hot deformation, dynamic recrystallization occurs when the accumulated dislocation density exceeds critical point. The dynamic recrystallized grains then nucleate at the grain boundary and grow on non‐growing grains and results in a refined microstructure. With full dynamic recrystallization, a near steady state flow stress is observed.…”

Section: Modeling Of Dynamic Recrystallizationmentioning

confidence: 99%

Modeling and Simulation of Dynamic Recrystallization Behavior in Alloyed Steel 15V38 during Hot Rolling

Wang

Chandrashekhara

Lekakh

et al. 2018

steel research int.

View full text Add to dashboard Cite

Dynamic recrystallization (DRX) occurring during hot rolling significantly affects the microstructural evolution and final mechanical properties of steel. In this study, single hot compression tests are performed at temperatures between 1000 and 1300 °C with strain rates between 0.01 and 15 s−1 to investigate dynamic recrystallization behavior of a 15V38 steel. Critical strains for initiation of dynamic recrystallization and peak strains are identified through the analysis of work hardening rate from the measured stress–strain results. Dynamic recrystallization is identified by the softening in the flow stress during plastic deformation and quantified as the difference between a calculated dynamic recovery curve and the measured stress–strain curve. Dynamic recrystallization is modeled using calculated critical strain, peak strain, Zener‐Hollomon (Z) parameter, and volume fraction of dynamic recrystallization. Subroutines accounting for dynamic recrystallization are developed and implemented into a three‐dimensional finite element model for hot rolling of a round bar. Simulation results show that dynamic recrystallization is distributed throughout the bar and exhibits a positive relationship with equivalent plastic strain. Temperature effects on dynamic recrystallization are also investigated using different rolling temperatures, and results show that the fraction of dynamic recrystallization is significantly increased as rolling temperature increases.

show abstract

“…Measurements of the equivalent diameter (ED) of the hard phases were carried out using image-analysis techniques. ED was determined from the following equation: (1) Where: A is the area of the hard phase particle, we can obtain it by the Image-pro plus software suite.…”

Section: Experimental Workmentioning

confidence: 99%

“…Al-Si alloys have good casting properties, stable hightemperature performance, and its casting has good air-tightness [1][2] . Using Al-Si alloys to make fuel engines has become the trend in automobile manufacturing industry since the 1970s 3 .…”

Section: Introductionmentioning

confidence: 99%

Rheo-Squeeze Casting of High-Silicon Aluminium Alloy Pipes with Gradient Structures and Their Mechanical Properties

Geng

Wang

et al. 2018

Mat. Res.

View full text Add to dashboard Cite

Three different compositions of high-Si Al alloy pipe, with a gradient structure, were produced through semi-solid rheological squeeze casting, the microstructural characteristics of which were investigated. The mechanism of gradient structure formation and the effect of acicular Fe-rich phases on liquid segregation were revealed. Meanwhile, the crystal structures of the Al 4 FeSi 2 and Al 15 (Fe, Mn) 3 Si 2 phase were elucidated. The relationship between the volume fraction of hard particles in the pipe wall and the macro-hardness was established. Wear resistance tests of the inner surfaces of the pipe walls, and tensile strength tests at different positions around the pipe walls, showed that the δ-Al 4 FeSi 2 phase (acicular Ferich phases) reduced the wear resistance and the tensile strength of the alloy. In this study, the gradient distribution of the hard particles caused the outside of the pipe wall to have a higher tensile strength.

show abstract

Microstructural evolution and high temperature flow behaviors of a homogenized Sr-modified Al-Si-Mg alloy

Cited by 62 publications

References 65 publications

The Flow Softening Behavior and Deformation Mechanism of AA7050 Aluminum Alloy

The Flow Softening Behavior and Deformation Mechanism of AA7050 Aluminum Alloy

Modeling and Simulation of Dynamic Recrystallization Behavior in Alloyed Steel 15V38 during Hot Rolling

Rheo-Squeeze Casting of High-Silicon Aluminium Alloy Pipes with Gradient Structures and Their Mechanical Properties

Contact Info

Product

Resources

About