Interface structure and chemistry in a novel steel-based composite Fe-TiB ₂ obtained by eutectic solidification

TY - JOUR

T1 - Interface structure and chemistry in a novel steel-based composite Fe-TiB 2 obtained by eutectic solidification

AU - Cha, Limei

AU - Lartigue-Korinek, Sylvie

AU - Walls, Michael

AU - Mazerolles, Leo

N1 - Funding Information: The authors are grateful to Marie-France Trichet for technical help in particular SEM experiments. They thank the Region Ile-de-France for convention SESAME 2008 E1845, for the support of the JEOL ARM 200F electron microscope installed at MPQ (UMR7162), and Guillaume Wang for his kind assistance on the Microscope. Frédéric Bonnet, from Arcelor Mittal Maizières Research SA is gratefully acknowledged for fruitful discussions. This work is supported by the Agence Nationale pour la Recherche through the ADRERA project No. ANR-09-MAPR-0001.

PY - 2012/10

Y1 - 2012/10

N2 - A new generation of steels, Fe-TiB 2 composites, is designed for automotive applications. The product displays both a high stiffness and a low density in comparison with existing steels and is prepared by eutectic solidification directly from the melt. A homogeneous distribution of TiB 2 particles is achieved. The structure and chemistry of the internal interfaces will clearly determine the quality of interfacial cohesion during processing and further loading. Here, fundamental investigations at the atomic level are performed by transmission electron microscopy. The preferred interface planes for diboride particles are prismatic {101̄0} planes (in the majority) and the basal plane. No second phase is detected at prismatic planes. Basal type interfaces appear more or less covered by TiC particles, which are also present in the bulk and at iron grain boundaries. The interfacial crystallography and defects are accurately determined. Our results strongly support the good interfacial cohesion assumed for this novel steel-based composite displaying enhanced mechanical behaviour.

AB - A new generation of steels, Fe-TiB 2 composites, is designed for automotive applications. The product displays both a high stiffness and a low density in comparison with existing steels and is prepared by eutectic solidification directly from the melt. A homogeneous distribution of TiB 2 particles is achieved. The structure and chemistry of the internal interfaces will clearly determine the quality of interfacial cohesion during processing and further loading. Here, fundamental investigations at the atomic level are performed by transmission electron microscopy. The preferred interface planes for diboride particles are prismatic {101̄0} planes (in the majority) and the basal plane. No second phase is detected at prismatic planes. Basal type interfaces appear more or less covered by TiC particles, which are also present in the bulk and at iron grain boundaries. The interfacial crystallography and defects are accurately determined. Our results strongly support the good interfacial cohesion assumed for this novel steel-based composite displaying enhanced mechanical behaviour.

KW - Atomic level

KW - Composite

KW - Fe-TiB

KW - Interfaces

KW - Transmission electron microscopy

UR - http://www.scopus.com/inward/record.url?scp=84866729901&partnerID=8YFLogxK

U2 - 10.1016/j.actamat.2012.08.017

DO - 10.1016/j.actamat.2012.08.017

M3 - 文章

AN - SCOPUS:84866729901

SN - 1359-6454

VL - 60

SP - 6382

EP - 6389

JO - Acta Materialia

JF - Acta Materialia

IS - 18

ER -