|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals, and Materials
||Interfacial Strength Characterization in a High-modulus Low-density Steel-based Fe-TiB2 Composite
||Yizhuang Li, Mingxin Huang
|On-Site Speaker (Planned)
The titanium diboride (TiB<SUB>2</SUB>)-reinforced steel composite, designed for automotive applications, exhibits a combination of high isotropic Young’s modulus and low density as compared to existing advanced high strength steels (AHSS). The steel-based composite is produced by in-situ precipitation of TiB<SUB>2</SUB> particles during eutectic solidification followed by hot rolling, and its microstructure displays a homogeneous distribution of both large primary TiB<SUB>2</SUB> and small eutectic TiB<SUB>2</SUB> particles in the ferrite matrix. Instead of interfacial debonding, particle cracking is the primary mode of damage, revealing high interfacial strength. To investigate the intrinsic interfacial strength, a hybrid method combining both nanoindentation and finite element analysis (FEA) was used. A micron-sized sample containing a single crystal TiB<SUB>2</SUB> attaching to the ferrite matrix was fabricated by focused iron beam (FIB), and was compressed using nanoindentation with a flat indentation tip. By combining the compression and FEA results, the interfacial strength was determined.
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