Repositorio
Institucional

Briones, Francisco

Seriacopi, Vanessa

Martinez, Carola

Valin, Jose Luis

Centeno, Dany

Machado, Izabel Fernanda

The effects of pressure and pressure routes on the microstructural evolution and mechanical properties of sintered copper via SPS

ELSEVIER

JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T

en

Spark Plasma Sintering (SPS) is a pressure-assisted sintering process in which high density and mechanical properties are usually reached. This study applied the SPS to consolidate copper powder using different sintering pressures and pressure routes during holding time or heating. In the first route, the pressure was maintained (around 15 MPa) during the heating up to the sintering temperature (650 oC), and the pressure was increased during the holding time. In the second route, the pressure was raised during the heating and kept constant during holding time at 650 oC. Three different pressure levels were applied on each route: 110, 65, and 50 MPa. Microstructural evolution was investigated using densi-fication (Archimedes method), scanning electron microscopy (SEM), hardness, and X-ray diffraction (XRD). The increase in pressure improves the microstructural features. In addition, in the first route, in which higher pressure rates were found, grain growth inhi-bition was observed, and densification was also improved significantly. The smallest crystallite size and highest microstrain were also observed at higher pressures. The in-crease in pressure also led to a rise in microhardness (17%), a decrease in pore volume fraction (10.5%), and an increase in pore circularity, causing substantial variations between the microstructures of samples. A finite element method (FEM) analysis was conducted using a thermo-mechanical approach to evaluate the stress distribution in the two different sintering routes. The results agree with the experimental results, and more pronounced effects were found in the first route because of higher compressive stresses, corroborating the results of microstrain and hardness.(c) 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

2023

artículo original

10.1016/j.jmrt.2023.06.099

PDF

Copper

SPS

Microstructure

Pressure application route influence

Ciencia de Materiales

Metalurgia e Ingeniería Metalúrgica

Cobre

MSF

Microestructura

Influencia de la ruta de aplicación de presión

2455.0

2470

artículo original

versión publicada

CC BY-NC-ND 4.0

CC BY-NC-ND 4.0

acceso abierto

acceso abierto

WOS:001092257300001

2238-7854

Verde# dorado

Ciencia de Materiales

Metalurgia e Ingeniería Metalúrgica

FAPESP 2020/10653-5