Influence of heterogeneities with different length scale on the plasticity of Fe-base ultrafine eutectic alloys

The evolution of microstructure and its influence on the mechanical properties ofhigh-strength ultrafine eutectic Fe–(Ti, Zr)–(B, Co) alloys has been studied. Theaddition of B or Co improves the room temperature compressive plasticity from 1% to∼8.5% or ∼14%, respectively, due to the formation of a heterogeneous microstructurewith distinctly different length scales, which can delay the propagation of shear bandsand promotes the activation of multiple shear bands.

[1]  D. Kim,et al.  Enhancement of plasticity in Ti-rich Ti–Zr–Be–Cu–Ni bulk metallic glasses , 2005 .

[2]  T. Hufnagel,et al.  Mechanical behavior of amorphous alloys , 2007 .

[3]  D. V. Louzguine-Luzgin,et al.  Investigation of Ti-Fe-Co bulk alloys with high strength and enhanced ductility , 2005 .

[4]  Hays,et al.  Microstructure controlled shear band pattern formation and enhanced plasticity of bulk metallic glasses containing in situ formed ductile phase dendrite dispersions , 2000, Physical review letters.

[5]  Michael J. Lance,et al.  Indentation-induced phase transformations in silicon: influences of load, rate and indenter angle on the transformation behavior , 2005 .

[6]  Lai‐Chang Zhang,et al.  High strength Ti–Fe–Sn ultrafine composites with large plasticity , 2007 .

[7]  En Ma,et al.  Controlling plastic instability , 2003, Nature materials.

[8]  Yu‐Chan Kim,et al.  Role of nanometer-scale quasicrystals in improving the mechanical behavior of Ti-based bulk metallic glasses , 2003 .

[9]  Myung-Shin Lee,et al.  High strength ultrafine eutectic Fe–Nb–Al composites with enhanced plasticity , 2008 .

[10]  J. Eckert,et al.  Microstructural investigation of a deformed Ti66.1Cu8Ni4.8Sn7.2Nb13.9 nanostructure–dendrite composite , 2007 .

[11]  Wonbaek Kim,et al.  Deformation-induced rotational eutectic colonies containing length-scale heterogeneity in an ultrafine eutectic Fe83Ti7Zr6B4 alloy , 2007 .

[12]  K. T. Ramesh,et al.  Enhanced plastic strain in Zr-based bulk amorphous alloys , 2001 .

[13]  Tae Eung Kim,et al.  Nanostructure–dendrite composites in the Fe–Zr binary alloy system exhibiting high strength and plasticity , 2007 .

[14]  Fenghua Zhou,et al.  High tensile ductility in a nanostructured metal , 2002, Nature.

[15]  D. V. Louzguine-Luzgin,et al.  Deformation-induced transformations in Ti60Fe20Co20 alloy , 2007 .

[16]  T. Ohkubo,et al.  Stress–strain behaviors of Ti-based bulk metallic glass and their nanostructures , 2007 .

[17]  U. Kühn,et al.  ZrNbCuNiAl bulk metallic glass matrix composites containing dendritic bcc phase precipitates , 2002 .

[18]  D. V. Louzguine-Luzgin,et al.  Influences of additional alloying elements (V, Ni, Cu, Sn, B) on structure and mechanical properties of high-strength hypereutectic Ti–Fe–Co bulk alloys , 2006 .

[19]  Dongjo Kim,et al.  In situ formation of two amorphous phases by liquid phase separation in Y–Ti–Al–Co alloy , 2004 .

[20]  J. S. Park,et al.  Mechanical behaviors of partially devitrified ti-based bulk metallic glass , 2005 .

[21]  J. Eckert,et al.  Ultrafine composite microstructure in a bulk Ti alloy for high strength, strain hardening and tensile ductility , 2006 .

[22]  D. V. Louzguine-Luzgin,et al.  Deformation behavior of high strength metastable hypereutectic Ti–Fe–Co alloys , 2007 .

[23]  Ludwig Schultz,et al.  Novel Ti-base nanostructure–dendrite composite with enhanced plasticity , 2003, Nature materials.

[24]  J. Eckert,et al.  Propagation of shear bands and accommodation of shear strain in the Fe56Nb4Al40 ultrafine eutectic-dendrite composite , 2008 .

[25]  Robert J. Asaro,et al.  Toward a quantitative understanding of mechanical behavior of nanocrystalline metals , 2007 .

[26]  T. Hufnagel,et al.  Metallic glass matrix composite with precipitated ductile reinforcement , 2002 .

[27]  Wolfgang Löser,et al.  High-strength Ti-base ultrafine eutectic with enhanced ductility , 2005 .

[28]  G. J. Fan,et al.  Plastic deformation and fracture of ultrafine-grained Al–Mg alloys with a bimodal grain size distribution , 2006 .

[29]  K. Yao,et al.  Superductile bulk metallic glass , 2006 .

[30]  J. Eckert,et al.  Microscopic deformation mechanism of a Ti66.1Nb13.9Ni4.8Cu8Sn7.2 nanostructure–dendrite composite , 2006 .