Influence of SDAS on the High Temperature Tensile Behaviour of the C355 Al Alloy

2014 ◽  
Vol 783-786 ◽  
pp. 228-233 ◽  
Author(s):  
Lorella Ceschini ◽  
A. Jarfors ◽  
A. Morri ◽  
A. Morri ◽  
F. Rotundo ◽  
...  
Keyword(s):  
High Temperature ◽  
Hot Isostatic Pressing ◽  
Microstructural Characterization ◽  
Tensile Tests ◽  
Tensile Behaviour ◽  
Al Alloy ◽  
Casting Condition ◽  
Secondary Dendrite Arm Spacing ◽  
Heat Treated ◽  
High Temperature Tensile

The aim of the present study was to characterize the high temperature tensile behaviour of the C355 (Al-Si-Cu-Mg) alloy produced under controlled casting condition so as to obtain different secondary dendrite arm spacing (SDAS). C355 samples were produced through a gradient solidification equipment able to produce microstructures with fine (20-25 μm) and coarse (50-70 μm) SDAS values. The as-produced specimens were subjected to hot-isostatic pressing and then T6 heat treated. Microstructural characterization, room and high temperature (200 °C) tensile tests were carried out on the heat treated specimens. The tensile behaviour was related to the different SDAS value of the samples.

High Temperature Tensile Behaviour of the A354 Aluminum Alloy

2014 ◽  
Vol 794-796 ◽  
pp. 443-448 ◽  
Author(s):  
Lorella Ceschini ◽  
Anders E.W. Jarfors ◽  
Alessandro Morri ◽  
Andrea Morri ◽  
Fabio Rotundo ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
High Temperature ◽  
Hot Isostatic Pressing ◽  
Tensile Tests ◽  
Tensile Behaviour ◽  
Fine Microstructure ◽  
Coarse Microstructure ◽  
Casting Aluminum ◽  
Temperature Exposure ◽  
High Temperature Tensile

The high temperature tensile behaviour of the A354 casting aluminum alloy was investigated also evaluating the influence of secondary dendrite arm spacing (SDAS). Cast specimens were produced through a gradient solidification equipment, obtaining two different classes of SDAS, namely 20-25 µm (fine microstructure) and 40-50 µm (coarse microstructure). After hot isostatic pressing and T6 heat treatment, the samples underwent mechanical characterization both at room and high temperature (200 °C). Results of tensile tests and hardness measurements were related to the microstructural features and fractographic characterization, in order to investigate the effect of microstructure and high temperature exposure on the mechanical behaviour of the alloy.

Correlation between Aging Effects and High Temperature Mechanical Properties of the Unmodified A356 Foundry Aluminium Alloy

2016 ◽  
Vol 879 ◽  
pp. 424-429 ◽  
Author(s):  
Maria Teresa di Giovanni ◽  
Emanuela Cerri ◽  
Mattia Merlin ◽  
Daniele Casari ◽  
Lars Arnberg ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Tensile Tests ◽  
Aging Effects ◽  
High Temperature Mechanical Properties ◽  
Dynamic Aging ◽  
Aluminium Casting Alloy ◽  
Heat Treated ◽  
High Temperature Tensile ◽  
Hardness Values

In this study, the effect of aging on the mechanical properties of unmodified A356 aluminium casting alloy with trace additions of Ni or V was investigated. Trace elements were added in concentrations of 600 and 1000 ppm of Ni and V, respectively. Samples from sand and permanent mould castings in as cast and T6 heat-treated conditions were tested. Tensile tests were performed at both room and high temperature (235 °C). Taking into account the results from both testing conditions, Vickers hardness was measured in order to endorse the hypothesis of artificial aging occurring during high temperature tensile tests. In order to study this effect, a series of specimens was aged at 235 °C for different aging times, and aging curves were plotted. The occurrence of static and dynamic aging was evaluated by comparing hardness values of tensile specimens and aged samples, particularly in the range of 5-20 min, as this range corresponds to the time necessary for pre-heating and testing of the tensile samples. A basic correlation between tensile strength and hardness is also given.

Effect of Mo Addition on Room and High Temperature Tensile Behavior of Al-Si-Cu-Mg Alloy in As-Cast and Heat-Treated Conditions

2019 ◽  
Vol 1155 ◽  
pp. 71-79
Author(s):  
Mohammadreza Zamani ◽  
Stefania Toschi ◽  
Alessandro Morri ◽  
Lorella Ceschini ◽  
Salem Seifeddine
Keyword(s):  
High Temperature ◽  
Tensile Behavior ◽  
Mg Alloy ◽  
High Melting Point ◽  
Treated Condition ◽  
Heat Treated ◽  
Heat Treated Condition ◽  
High Temperature Tensile ◽  
Negligible Influence

This study focuses on the role of Mo addition on the mechanical properties of an Al-Si-Cu-Mg alloy in as-cast and heat-treated condition at ambient and elevated temperature. Addition of 0.4 to 0.6 wt.% Mo forms Mo-bearing dispersoid particles which have a relatively high melting point and improve high temperature tensile strength. Ductility suffered in the presence of Mo-bearing particles. Trace addition of Mo up to 0.6 wt.% has a negligible influence on the yield strength and hardness of Al-Si-Cu-Mg alloy in as-cast and heat-treated conditions at ambient temperature and 250 °C.

Precipitation Studies of Undeformed and ECAP-Deformed Al-4%Cu Alloys: Effects on Microstructure and Tensile Properties

2008 ◽  
Vol 584-586 ◽  
pp. 708-715 ◽  
Author(s):  
Erika Fernanda Prados ◽  
Vitor Luiz Sordi ◽  
Maurizio Ferrante
Keyword(s):  
Initial Conditions ◽  
Tensile Tests ◽  
Solution Temperature ◽  
Tensile Behaviour ◽  
Total Strength ◽  
Angular Pressing ◽  
Cu Alloy ◽  
Transmission Electron ◽  
Heat Treated ◽  
Precipitation Heat

The present study is an assessment of the effects of precipitation heat treatments on tensile behaviour, work hardening (WH) characteristics and microstructural evolution of an Al-4%Cu alloy deformed by equal channel angular pressing (ECAP). Two ageing temperatures were employed (170 and 100oC) and their effect on strength and WH behaviour was compared with that exerted on the same alloy, but in two different initial conditions: quenched from solution temperature and slowly cooled before anneal. Grain and precipitate sizes of samples deformed by one and four ECAP passes and heat treated as described were measured employing transmission electron microscopy (TEM). It was concluded that the lower ageing temperature gives the best combination of strength and ductility, a high WH rate and, possibly, the smaller grain and precipitate sizes. The relative participation of the various hardening mechanisms to total strength was estimated from tensile tests and hardness measurements.

Sign in / Sign up

Export Citation Format

Share Document