TY - JOUR
T1 - Structure and mechanical behavior of ultrafine-grained aluminum-iron alloy stabilized by nanoscaled intermetallic particles
AU - Duchaussoy, Amandine
AU - Sauvage, Xavier
AU - Edalati, Kaveh
AU - Horita, Zenji
AU - Renou, Gilles
AU - Deschamps, Alexis
AU - De Geuser, Frédéric
N1 - Funding Information:
TEM in-situ experiments have been carried out on the GENESIS facility which is supported by the Région Normandie, the Métropole Rouen Normandie, the CNRS via LABEX EMC3 and the French National Research Agency as a part of the program “Investissements d'avenir” with the reference ANR-11-EQPX-0020. The TEM-ACOM measurements were performed within the framework of the Centre of Excellence of Multifunctional Architectured Materials “CEMAM” n° ANR-10-LABX-44-01. Both the Agence Nationale de la Recherche and the joint CNRS-JSPS 2017 summer program for the support to the trans-national collaboration are gratefully acknowledged for financial support (PRASA project- ANR-15-CE08-0029). This work was also supported in part by Grant-in-Aid for Scientific Research (S) from the MEXT, Japan (No. 26220909). HPT was carried out in the International Research Center on Giant Straining for Advanced Materials (IRC-GSAM) at Kyushu University.
Funding Information:
TEM in-situ experiments have been carried out on the GENESIS facility which is supported by the Région Normandie , the Métropole Rouen Normandie , the CNRS via LABEX EMC3 and the French National Research Agency as a part of the program “Investissements d'avenir” with the reference ANR-11-EQPX-0020 . The TEM-ACOM measurements were performed within the framework of the Centre of Excellence of Multifunctional Architectured Materials "CEMAM" n° ANR-10-LABX-44-01 . Both the Agence Nationale de la Recherche and the joint CNRS-JSPS 2017 summer program for the support to the trans-national collaboration are gratefully acknowledged for financial support ( PRASA project - ANR-15-CE08-0029 ). This work was also supported in part by Grant-in-Aid for Scientific Research (S) from the MEXT, Japan (No. 26220909 ). HPT was carried out in the International Research Center on Giant Straining for Advanced Materials (IRC-GSAM) at Kyushu University.
Publisher Copyright:
© 2019 Acta Materialia Inc.
PY - 2019/4/1
Y1 - 2019/4/1
N2 - Ultrafine-grained aluminum alloys offer interesting multifunctional properties with a combination of high strength, low electrical resistivity, and low density. However, due to thermally induced grain coarsening, they typically suffer from an intrinsic poor thermal stability. To overcome this drawback, an Al-2%Fe alloy has been selected because of the low solubility of Fe in Al and their highly positive enthalpy of mixing leading to the formation of stable intermetallic particles. The two-phase alloy has been processed by severe plastic deformation to achieve simultaneously submicrometer Al grains and a uniform distribution of nanoscaled intermetallic particles. The influence of the level of deformation on the microstructure has been investigated thanks to transmission electron microscopy and atom probe tomography and it is shown that for the highest strain a partial dissolution of the metastable Al 6 Fe particle occurred leading to the formation of a Fe super saturated solid solution. The thermal stability, and especially the precipitation of particles from the ultrafine-grained solid solution and the way they pin grain boundaries has been investigated both from static annealing and in-situ transmission electron microscopy experiments. The correlation between microstructural features and microhardness has been established to identify the various strengthening contributions. Finally, it is shown that ultrafine grained high purity Al with less than 0.01 at. % Fe in solid solution could preserve a grain size only 300 nm after 1 h at 250 °C.
AB - Ultrafine-grained aluminum alloys offer interesting multifunctional properties with a combination of high strength, low electrical resistivity, and low density. However, due to thermally induced grain coarsening, they typically suffer from an intrinsic poor thermal stability. To overcome this drawback, an Al-2%Fe alloy has been selected because of the low solubility of Fe in Al and their highly positive enthalpy of mixing leading to the formation of stable intermetallic particles. The two-phase alloy has been processed by severe plastic deformation to achieve simultaneously submicrometer Al grains and a uniform distribution of nanoscaled intermetallic particles. The influence of the level of deformation on the microstructure has been investigated thanks to transmission electron microscopy and atom probe tomography and it is shown that for the highest strain a partial dissolution of the metastable Al 6 Fe particle occurred leading to the formation of a Fe super saturated solid solution. The thermal stability, and especially the precipitation of particles from the ultrafine-grained solid solution and the way they pin grain boundaries has been investigated both from static annealing and in-situ transmission electron microscopy experiments. The correlation between microstructural features and microhardness has been established to identify the various strengthening contributions. Finally, it is shown that ultrafine grained high purity Al with less than 0.01 at. % Fe in solid solution could preserve a grain size only 300 nm after 1 h at 250 °C.
UR - http://www.scopus.com/inward/record.url?scp=85060883888&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85060883888&partnerID=8YFLogxK
U2 - 10.1016/j.actamat.2019.01.027
DO - 10.1016/j.actamat.2019.01.027
M3 - Article
AN - SCOPUS:85060883888
VL - 167
SP - 89
EP - 102
JO - Acta Materialia
JF - Acta Materialia
SN - 1359-6454
ER -