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Doctoral Thesis
DOI
10.11606/T.88.2004.tde-25072012-143154
Document
Author
Full name
Valdinei Ferreira da Silva
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2004
Supervisor
Committee
Bose Filho, Waldek Wladimir (President)
Andrade, Arnaldo Homobono Paes de
Araújo, José Alexander
Ferrante, Maurizio
Tarpani, José Ricardo
Title in Portuguese
Comportamento da liga de alumínio A356-T6 fundida e tixoextrudada sob fadiga isotérmica e termomecânica
Keywords in Portuguese
Fadiga isotérmica
Fadiga termomecânica
Fundido
Liga de alumínio A356-T6
Processamento no estado semi-sólido
Tixoextrusão
Abstract in Portuguese
Gradientes térmicos induzidos no interior de componentes sujeitos a variações de temperatura durante o período de funcionamento podem provocar a ocorrência de tensões e deformações internas. A repetição destes ciclos térmicos pode causar a nucleação e a propagação de trincas por um processo denominado fadiga termomecânica. Este trabalho apresenta um estudo sobre o comportamento da liga de alumínio A356-T6, processada nas condições fundida e tixoextrudada, sob fadiga isotérmica e termomecânica. Foram realizados ensaios de fadiga de baixo ciclo isotérmica para as temperaturas de 120 e 280°C, e ensaios de fadiga termomecânica em-fase e fora-de-fase para a faixa de temperatura de 120 a 280°C. O material tixoextrudado apresentou melhor desempenho em fadiga nas condições isotérmica e anisotérmica (termomecânica) devido a uma microestrutura globular com menor nível de porosidade.
Title in English
Casting and tixoextruded A356-T6 aluminum alloy behavior under isothermal and thermomechanical fatigue
Keywords in English
A356-T6 aluminum alloy
Casting
Fatigue
Isothernal fatigue
Semi-solid processing
Thermomechanical fatigue
Tixoextruded
Abstract in English
Thermal gradients induced in components during service under temperature changes can cause internal stresses and strains. This cyclic thermal behavior can cause crack nucleation and propagation under a process denominated thermomechanical fatigue. Permanent mold casting and tixoextruded A356-T6 aluminum alloy behavior under isothermal and thermomechanical fatigue was study in this work. Isothermal low cycle fatigue tests were performed in temperatures of 120 and 280°C. In-phase and out-of-phase thermomechanical fatigue tests were carried out in temperature range from 120 to 280°C. The tixoextruded material presented better isothermal and thermomechanical fatigue performance due to a globular microstructure and lower porosity level.
 
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Publishing Date
2012-07-25
 
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