scholarly journals Modeling Precipitation Hardening and Yield Strength in Cast Al-Si-Mg-Mn Alloys

Metals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1356 ◽  
Author(s):  
Emre Cinkilic ◽  
Xinyan Yan ◽  
Alan A. Luo
Keyword(s):  
Heat Treatment ◽  
Yield Strength ◽  
Precipitate Morphology ◽  
Solid Solution Strengthening ◽  
Casting Alloys ◽  
Precipitate Shape ◽  
Optimized Model ◽  
Solution Strengthening ◽  
Die Castings ◽  
Pressure Die Casting

An integrated precipitation and strengthening model, incorporating the effect of precipitate morphology on precipitation kinetics and yield strength, is developed based on a modified Kampmann–Wagner numerical (KWN) framework with a precipitate shape factor. The optimized model was used to predict the yield strength of Al-Si-Mg-Mn casting alloys produced by vacuum high pressure die casting at various aged (T6) conditions. The solid solution strengthening contribution of Mn, which is a common alloying element to avoid die soldering, was included in the model to increase the prediction accuracy. The experimental results and simulations show good agreement and the model is capable of reliably predicting yield strength of aluminum die castings after T6 heat treatment, providing a useful tool to tailor heat treatment for a variety of applications.

Deformation Mechanism of Nanocrystalline Al-Fe Alloys by Analysis from Ab-Initio Calculations

2006 ◽  
Vol 503-504 ◽  
pp. 209-214 ◽  
Author(s):  
Tokuteru Uesugi ◽  
Yorinobu Takigawa ◽  
Kenji Higashi
Keyword(s):  
Experimental Data ◽  
Solid Solution ◽  
Yield Strength ◽  
First Principles ◽  
High Strength ◽  
Misfit Strain ◽  
Solid Solution Strengthening ◽  
Solution Strengthening ◽  
Fe Alloys ◽  
Quench Method

Recently nanocrystalline Al-Fe alloys produced by a vapor quench method have been reported. These alloys are supersaturated solid solution and exhibit high strength with good ductility. It is postulated that the high strength of the Al-Fe alloys could be achieved by both the nano-grained structures and the solid solution strengthening. The contribution to the yield strength due to both the grain size strengthening and the solid solution strengthening were analyzed from the experimental data. Then the contribution to the yield strength due to the solid solution strengthening was estimated from the misfit strain calculated from the first principles in order to compare with analytical results estimated from the experimental data.

The Effect of Heat Treatment on Microstructure and Mechanical Properties of ZK60 Alloy

2007 ◽  
Vol 353-358 ◽  
pp. 718-721
Author(s):  
Ding Fei Zhang ◽  
Rong Shen Liu ◽  
Jian Peng ◽  
Wei Yuang ◽  
Hong Ju Zhang
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Solid Solution ◽  
Age Hardening ◽  
Second Phase ◽  
Solid Solution Strengthening ◽  
Microstructure And Mechanical Properties ◽  
Long Time ◽  
Zk60 Alloy ◽  
Solution Strengthening

With different heat treatment, the microstructure and mechanical properties of ZK60 magnesium alloy were investigated. It can be concluded that heat treatment has great effect on mechanical properties of ZK60. With artificial aging after extruding, the precipitation of the second phase from the supersaturated solid solution significantly improved mechanical properties. It can greatly increase yield strength of ZK60 alloy, while the tensile strength has little change. For the combination of solid solution strengthening and age hardening, two opposite factors must be considered. On one hand, the solid solution strengthening and the later precipitation strengthening is good for alloy’s strength; on the other hand, the properties decrease as the grains grew under high temperature for a long time during solution heating.

Study on Microstructure and Properties of Mg-9Al-xZn Alloys

2005 ◽  
Vol 475-479 ◽  
pp. 477-480
Author(s):  
Xi Yan Zhang ◽  
Feng Jiang ◽  
Shi-jie Zhou ◽  
Chong Jia ◽  
Min Zhao ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Solid Solution ◽  
Corrosion Resistance ◽  
Chemical Composition ◽  
Close Relation ◽  
Microstructure And Properties ◽  
Solid Solution Strengthening ◽  
Mg17al12 Phase ◽  
Solution Strengthening ◽  
Zn Alloys

Some Zn and a little Ag are added into ZM5 magnesium alloy (one of Mg-9 wt%Al-1 wt%Zn alloys in China), and the differences of the microstructures and properties between the new alloy and ZM5 is investigated. Effects of heat treatment and alloying elements (Zn and Ag) on the microstructure and tensile properties of Mg-9Al-xZn alloys, and relationships between the chemical composition, microstructure and properties are investigated. Zn ad Ag have obvious solid solution strengthening effects on Mg-9Al-xZn alloy, while Ag is detrimental to the corrosion resistance after being artificial aged. The morphology of pearlite-like secondary γ(Mg17Al12) phase (γII) has close relation with the properties.

Mechanical Properties and Microstructure of Strip Casted Ag-27%Cu-25%Zn-3%Sn Brazing Alloy

2007 ◽  
Vol 26-28 ◽  
pp. 485-488 ◽  
Author(s):  
Kee Ahn Lee ◽  
Sung Jun Kim ◽  
Moon Chul Kim
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Solid Solution ◽  
Microstructural Analysis ◽  
Mechanical Tests ◽  
Rich Phase ◽  
Aging Heat Treatment ◽  
Solid Solution Strengthening ◽  
Solution Strengthening ◽  
Twin Roll

This work sought to examine the suitability of twin roll strip casting for Ag-27%Cu- 25%Zn-3%Sn brazing alloy (BAg-7A) and to investigate the mechanical properties and microstructure of the strip. The effect of aging heat treatment on the properties was also studied. This new manufacturing process has applications in the production of the brazing alloy. XRD and microstructural analysis of the Ag-27%Cu-25%Zn-3%Sn strip represented eutectic microstructure of a Cu-rich phase and a Ag-rich matrix regardless of heat treatment. The results of mechanical tests showed tensile strength of 470MPa, a significant enhancement; and an 18% elongation of the twin roll casted strip, due mainly to the solid solution strengthening of Zn atoms (~20%) in the Cu-rich phases. Tensile results showed gradually decreasing strengths and increasing elongation with aging heat treatment. Microstructural evolution and fractography were also investigated and related to the mechanical properties.

Effects of Physical Melt Treatments on Microstructural Evolution and Anodizing Characteristics of Al-Si Casting Alloys

2011 ◽  
Vol 695 ◽  
pp. 243-246 ◽  
Author(s):  
Je Sik Shin ◽  
Bong Hwan Kim ◽  
Sang Mok Lee
Keyword(s):  
Heat Treatment ◽  
High Pressure ◽  
Aluminum Alloys ◽  
Die Casting ◽  
Microstructural Feature ◽  
Casting Alloys ◽  
Melt Treatment ◽  
Twin Screw ◽  
A356 Aluminum ◽  
Pressure Die Casting

In order to investigate the effects of physical melt treatment on microstructural feature and anodizing characteristics of Al-Si system casting alloys, A380 and A356 aluminum alloys were chosen and a twin-screw melt-shearing process was utilized before high pressure die casting. In order to refine and homogenize the microstructure of the diecast Al-Si alloys, the melt-shearing process parameters were controlled and T6 heat treatment was carried out.

scholarly journals Physical Metallurgy of Modern Creep-Resistant Steel for Steam Power Plants: Microstructure and Phase Transformations

2016 ◽  
Vol 2016 ◽  
pp. 1-19 ◽  
Author(s):  
V. C. Igwemezie ◽  
C. C. Ugwuegbu ◽  
U. Mark
Keyword(s):  
Heat Treatment ◽  
Power Plant ◽  
Power Plants ◽  
Physical Metallurgy ◽  
Steam Power ◽  
Solid Solution Strengthening ◽  
Steam Power Plants ◽  
Solution Strengthening ◽  
Higher Temperature ◽  
Microstructure Of The Material

The fact that the microstructure of steel depends on its composition and the heat treatment given to it has been heavily exploited in the design of steel for power plant applications. To obtain a steel that can function at the higher temperature where power plants operate without failure for extended life, heat treatment is needed to produce fine and highly stable dispersion of carbides, nitrides, and intermetallic compounds in the microstructure of the material. A significant contribution also comes from solid solution strengthening by substitutional solutes. We review here various types of phases, microstructures, functions, and interacting effects of the various alloying elements in the design of steel for modern power plant application.

Direct Observation of a New Coherent Precipitate in Commercial Nickel-Base Alloys

1971 ◽  
Vol 29 ◽  
pp. 198-199
Author(s):  
J. E. Doherty ◽  
D. E. Fornwalt ◽  
B. H. Kear
Keyword(s):  
Heat Treatment ◽  
Solid Solution ◽  
Nickel Base Superalloy ◽  
Solid Solution Strengthening ◽  
Carbide Phases ◽  
Coherent Precipitate ◽  
Boundary Properties ◽  
Solution Strengthening ◽  
Nickel Base ◽  
Base Superalloy

A nickel-base superalloy consists essentially of a Ni/Cr solid solution γ matrix strengthened by the precipitation of the γ' phase, Ni3 (Al,Ti). In commercial alloys, transition metal additions are made for solid solution strengthening and C, B and Zr are added to improve grain boundary properties. The carbon reacts to form a variety of carbide phases. (MC, M23C6, M6C and M7C3) depending on composition and heat treatment whereas the B normally reacts to form M3B2-type diborides. In what follows it is shown that in addition to these basic reactions, C and B together can combine with Ti and Nb to form a borocarbide phase. Evidence has also been found for the precipitation of γ within the interdendritic massive γ'.

Effect of Cold Rolling and Heat Treatment on Microstructure and Mechanical Properties of Pt-0.7Ti Microalloy

2015 ◽  
Vol 817 ◽  
pp. 645-650
Author(s):  
Qiong Zhao ◽  
Xiao Ge Zhang ◽  
Ye Fan ◽  
Guo Yi Qin ◽  
Si Yong Xu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Solid Solution ◽  
Cold Rolling ◽  
Annealing Treatment ◽  
Recrystallization Temperature ◽  
Micro Hardness ◽  
Solid Solution Strengthening ◽  
Solution Strengthening ◽  
Rolling Deformation

The effects of cold rolling, solid solution, aging and annealing treatment on Pt-0.7Ti microalloy were investigated in this study. The microstructures of Pt-0.7Ti microalloy and the precipitated ordered phase Pt8Ti were observed and analyzed by OM, TEM, XRD. The mechanical properties of the alloy were evaluated Vicker micro-hardness. The results showed that micro amount of Ti was an effective element for solid-solution strengthening of Pt, the micro-hardness of 97% deformation for ST and ST+AG samples increased to 214HVand 224HV, respectively, which almost are double that of pure Pt. Micro-amount of long range ordered phase Pt8Ti was precipitated during the heat treatment, but the effect of order hardening in Pt-0.7Ti microalloy was not obvious. The microhardness by large rolling deformation for quenched samples almost unchanged after an annealing below 500°C for 1h, but decreased significantly at 700°C, and the recrystallization temperature was risen by 200°C than that of pure Pt.

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