Banca de QUALIFICAÇÃO: Paul André

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : Paul André
DATE: 12/12/2023
TIME: 08:00
LOCAL: Microsoft TEAMS
TITLE:

EVALUATION OF MICROABRASIVE WEAR OF ALUMINUM ALLOY 6201 LAMINATED AND TREATED BY SOLUBILIZATION AND ARTIFICIAL AGING AND ALUMINUM ALLOY 1120 LAMINATED

KEY WORDS:

Solubilization, Artificial aging, Microabrasive wear, aluminum alloy

PAGES: 133
BIG AREA: Engenharias
AREA: Engenharia Mecânica
SUMMARY:

Aluminum Alloy 6201 (CAL) and/or Aluminum Alloy 1120 cables are used in overhead power transmission lines. Suspended, the cables are subjected to conditions in which the wind produces vibrations in the line, causing multiaxial tensions and partial slippage between the braided layers. , which can lead to failures due to fatigue or wear in the contact zone between the wire layers and between the wires and the suspension clips. The effect of heat treatments and cold working on the microabrasive wear of aluminum alloys 6201 and 1120 is little studied. This work aims to evaluate the microabrasive wear of laminated and heat-treated aluminum alloy 6201 and cold-rolled aluminum 1120. Microabrasive wear tests were carried out on samples of alloy 6201, solubilized at temperatures of 520º C, for a period of 2 hours, artificially aged and laminated-aged at a temperature of 200º C for 8 hours. Also cold-rolled 9.52 mm diameter 1120 aluminum-alloy rebars up to 4 mm diameter were tested under the same conditions. Wear tests were carried out using free ball microabrasive wear equipment, alumina abrasive mud (Al2O3) in a concentration of 0.40g/ml distilled water. Wear test data were processed using the Achard equation. The results of the microabrasive wear tests indicate that the rolled 1120 alloy samples show a decrease in the wear coefficient of 35% and a reduction in the wear rate of 32% in relation to the same non-rolled alloy. In the case of the rolled Al1120 alloy, cold working promotes the generation of interaction of dislocations with each other and with other obstacles, which make it difficult for the atomic planes to slide during the microabrasive test, reducing the wear coefficient. For aluminum alloy 6201, the wear coefficient was reduced by 20% after the artificial aging process and by 42% after the combined rolling and aging treatment in the same alloy. In this 6201 alloy, it is inferred that artificial aging led to the formation of Guinier-Preston zones, which evolved into the formation of metastable β” particles, coherent with the matrix, responsible for increasing the wear resistance of the aged alloy, making it difficult to movement of dislocations due to the size and distribution of precipitates and distortions in the crystalline lattice of the aluminum matrix. In this same 6201 alloy, the increase in resistance to microabrasive wear after rolling and heat treatment is also attributed to the combined effect of cold working, which increases the material's resistance through plastic deformation, creating obstacles for the movement of dislocations and the aging heat treatment. , which promotes distortions in the crystal lattice by β” particles coherent with the matrix.

 

COMMITTEE MEMBERS:
Externo ao Programa - 404835 - ANTONIO MANOEL DIAS HENRIQUES - nullPresidente - 1523261 - COSME ROBERTO MOREIRA DA SILVA
Externo à Instituição - FELIPE DA CRUZ DIAS - SEEDF
Interno - 1249764 - JORGE LUIZ DE ALMEIDA FERREIRA
Externo ao Programa - 2934459 - RODRIGO ARBEY MUNOZ MENESES - null