Microscopic deformation mechanism of a Ti66.1Nb13.9Ni4.8Cu8Sn7.2 nanostructure–dendrite composite

Kim, KB; Das, J.; Xu, Wei; Zhang, Zuo‐Feng; Eckert, J.

doi:10.1016/j.actamat.2006.04.006

Cited by 93 publications

(50 citation statements)

References 22 publications

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“…The dendrites act as obstacles isolating the highly localized shear bands in the small discrete interdendrite regions. [11,26,27] The motion of dislocations is blocked by the interface between the dendrites and the eutectic layers, leading to strengthening. At high stresses with the continued increase of the applied force, microcracks initiate at some stress-concentration locations at the interface and propagate along the interface, as shown in Figures 8(a) and (b).…”

Section: B Relationship Between the Microstructure And Compressive Pmentioning

confidence: 99%

Mg-Al-Ca In-Situ Composites with a Refined Eutectic Structure and Their Compressive Properties

Shi

2008

Metall Mater Trans A

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In a series of Mg x (Al 2 Ca) 100-x (76 £ x £ 87) ternary alloys near the Mg-(Mg,Al) 2 Ca pseudo-binary eutectic point, different phases and morphologies based on ultrafine eutectic microstructure have been obtained by controlling the composition and changing the cooling rate via either induction melting or copper mold casting. For 81 £ x £ 87, the chill-cast alloys with ductile Mg dendrites embedded in an ultrafine [Mg + (Mg,Al) 2 Ca] eutectic matrix exhibit gradually increased fracture strength from 415 to 491 MPa with the decrease of Mg content. At x = 79, the Mg 79 Al 14 Ca 7 alloy contains hard (Mg,Al) 2 Ca precipitates coexisting with ductile Mg dendrite, dispersed in the strong eutectic matrix. This alloy exhibits the highest compressive fracture strength (600 MPa), and the specific strength reaches 3.4 · 10 5 NAEmAEkg -1. The alloys all exhibit substantial plastic strain (5 to 6 pct). The attainment of such a combination of strength and plasticity is an interesting and useful step in improving the mechanical properties of lightweight Mg alloys.

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Section: B Relationship Between the Microstructure And Compressive Pmentioning

confidence: 99%

Mg-Al-Ca In-Situ Composites with a Refined Eutectic Structure and Their Compressive Properties

Shi

2008

Metall Mater Trans A

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“…19) The torsional dendrite causes change of the local volume between the dendrites and the eutectic. 20) So, the eutectic colonies 7) rotate to accommodate the change of the local volume inevitably. Moreover, the refined eutectic structure brings the nucleation of a large number of shear bands to accommodate the shear strain at the interface, which also facilitates the rotation of the eutectic colonies.…”

Section: Resultsmentioning

confidence: 99%

Ultrafine Eutectic-Dendrite Composite Bulk Fe-B Alloy with Enhanced Ductility

Yang

et al. 2009

Mater. Trans.

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Bulk Fe 2 B and Fe 3 B alloys have been prepared by a self-propagating high temperature synthesis combining rapid solidification technique. The Fe 2 B and Fe 3 B alloys are composed of t-Fe 2 B dendrite and ultrafine eutectic matrix with t-Fe 2 B and -Fe, and the dendrites are rounded by the matrix. The volume fractions of the dendrite of the Fe 2 B and Fe 3 B alloys are 90% and 20%, respectively. The fracture strength reduces from 3400 MPa to 2660 MPa with the increase of dendrite content, but the strain at fracture rises markedly from 3% to 19%. The result indicates that a small quantity of dendrites embedded in the ultrafine eutectic matrix can reinforce the ductility.

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“…It suggests that the dendrite turns to accommodation the rotation of the eutectic colonies. The rotation of the dendrites causes a local volume change at the interfacial areas between the dendrites and the matrix, [26] which causes the rotation of eutectic colonies. The composite structure undergoes a cycle of ''deformation-softening-more deformation'' until sample fracture.…”

Section: Mechanical Behaviormentioning

confidence: 99%

Enhanced Ductility of Dendrite‐Ultrafine Eutectic Composite Fe₃B Alloy Prepared by a Self‐Propagating High‐Temperature Synthesis

Yang

et al. 2009

Adv Eng Mater

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Microscopic deformation mechanism of a Ti66.1Nb13.9Ni4.8Cu8Sn7.2 nanostructure–dendrite composite

Cited by 93 publications

References 22 publications

Mg-Al-Ca In-Situ Composites with a Refined Eutectic Structure and Their Compressive Properties

Mg-Al-Ca In-Situ Composites with a Refined Eutectic Structure and Their Compressive Properties

Ultrafine Eutectic-Dendrite Composite Bulk Fe-B Alloy with Enhanced Ductility

Enhanced Ductility of Dendrite‐Ultrafine Eutectic Composite Fe₃B Alloy Prepared by a Self‐Propagating High‐Temperature Synthesis

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Microscopic deformation mechanism of a Ti66.1Nb13.9Ni4.8Cu8Sn7.2 nanostructure–dendrite composite

Cited by 93 publications

References 22 publications

Mg-Al-Ca In-Situ Composites with a Refined Eutectic Structure and Their Compressive Properties

Mg-Al-Ca In-Situ Composites with a Refined Eutectic Structure and Their Compressive Properties

Ultrafine Eutectic-Dendrite Composite Bulk Fe-B Alloy with Enhanced Ductility

Enhanced Ductility of Dendrite‐Ultrafine Eutectic Composite Fe3B Alloy Prepared by a Self‐Propagating High‐Temperature Synthesis

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Product

Resources

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Enhanced Ductility of Dendrite‐Ultrafine Eutectic Composite Fe₃B Alloy Prepared by a Self‐Propagating High‐Temperature Synthesis