High-strength Zr-Nb-(Cu,Ni,Al) composites with enhanced plasticity

Das, J.; Löser, W.; Kühn, U.; Eckert, J.; Roy, Siddhartha; Schultz, L.

doi:10.1063/1.1587254

Cited by 112 publications

(78 citation statements)

References 15 publications

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“…[4][5][6][7][8][9][10][11] The improved ductility originates from the formation of multiple shear bands initiated at the interface between the ductile phase and BMG matrix. 6) Moreover, the ductile phases in the BMG matrix increase the resistance for the propagating of shear bands.…”

Section: Discussionmentioning

confidence: 99%

“…6) Later, bulk metallic composites containing ductile -Zr(Ti, Nb) dendrites were also developed in Zr-Nb-Cu-Ni-Al alloys. 7,8) Another similar composite is the BMG matrix reinforced by Ta-or Nb-rich solid solution. [9][10][11] As one of new BMG system developed recently, Cu-based BMGs exhibit high strength and lower price.…”

Section: Introductionmentioning

confidence: 99%

“…To improve ductility, many attempts have been developed to reinforce BMGs, either by particle reinforcement, 2,3) fiber-reinforcement or in situ formation of ductile bcc-phase precipitates. [4][5][6][7][8] In particular, the in situ precipitated ductile phase can significantly improve the plasticity of BMGs. Hays et al firstly developed a Zr-Ti-Nb-Cu-Ni-Be bulk metallic glass in-situ composite by coupling a high strength glassy phase with a ductile bccZr(Ti, Nb) dendrites.…”

Section: Introductionmentioning

confidence: 99%

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Formation of High Strength In-situ Bulk Metallic Glass Composite with Enhanced Plasticity in Cu50Zr47.5Ti2.5 Alloy

Zhang

Zhu

et al. 2005

Mater. Trans.

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New high strength in-situ bulk metallic glass (BMG) composite with enhanced plasticity was synthesized in Cu 50 Zr 47:5 Ti 2:5 alloy. The enhanced phase is the primary crystalline precipitate, ZrCu phase. The in-situ bulk metallic glass composite with a diameter of 1.5 mm was successfully fabricated by copper mold casting Cu 50 Zr 47:5 Ti 2:5 alloy. For the as-cast rod with a diameter of 1.5 mm, the compressive fracture strength and compressive fracture strain are 2.24 GPa and 10.5%, respectively. The precipitated ZrCu phase results in the formation of the large amount of shear bands in the whole specimen. This is the reason for the high plasticity of the in situ Cu 50 Zr 47:5 Ti 2:5 BMG composite with the mixed structure of the ZrCu phase dispersing in the BMG matrix.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Formation of High Strength In-situ Bulk Metallic Glass Composite with Enhanced Plasticity in Cu50Zr47.5Ti2.5 Alloy

Zhang

Zhu

et al. 2005

Mater. Trans.

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“…[1][2][3] In order to overcome this disadvantage of monolithic BMGs, several attempts have been made to improve the plastic deformability by introducing nanometerscale precipitates [4][5][6] and micrometer-scale ductile crystalline phases. [7][8][9] This idea opens a door for processing a new class of Ti- 10,11) and Zr-based 12) alloys with glassy or nanostructured matrix and ductile primary dendrites, has been already reported.…”

Section: Introductionmentioning

confidence: 99%

Impact of Microstructural Inhomogenities on the Ductility of Bulk Metallic Glasses

et al. 2007

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To circumvent the limited ductility of bulk metallic glasses (BMGs), heterogeneous materials with glassy matrix and different type and length-scale of heterogeneities (micrometer-sized second phase particles or fibers, nanocrystals in a glassy matrix, phase separated regions, variations in short-range order by clustering) have been developed in order to control the mechanical properties. As example, recent results obtained for Cu-and Ti-base structurally imhomogeneous bulk metallic glasses will be presented. This type of clustered glasses is able to achieve high strength together with pronounced work hardening and large ductility by controlling the instabilities otherwise responsible for early failure. We emphasize the possibilities to manipulate such spatially inhomogeneous glassy structures based on martensitic alloys in favor of either strength and ductility, or a combination of both and also discuss the acquired ability to synthesize such M-glasses in bulk form through inexpensive processing routes.

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“…[3][4][5][6] Addition of Nb in Zr-Al-Ni-Cu (-Be or -Ti) also leads to the stabilization of -Zr to form glassy matrix/ductile -Zr dendrite composites. [7][8][9][10] Although Nb has been reported to improve the mechanical properties in some Zr-based BMGs, 11,12) its effects can be significantly different in other alloy systems. In the present work, the effects of substitution of Zr with Nb on the glass-forming ability and thermal stability of the Zr 62Àx Nb x Cu 15:4 Ni 12:6 Al 10 glassy alloys were investigated.…”

Section: Introductionmentioning

confidence: 99%

Formation, Thermal Stability and Mechanical Properties of Zr-Nb-Cu-Ni-Al Bulk Metallic Glasses

et al. 2006

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Bulk Zr 62Àx Nb x Cu 15:4 Ni 12:6 Al 10 (x ¼ 0{10 at%) glassy alloys were prepared via copper mould casting. XRD, DSC, SEM and compression test show appropriate niobium addition can enhance the glass forming ability (GFA) and thermal stability of these alloys. The bulk amorphous alloy with x ¼ 2:5 displays the largest temperature interval of supercooled liquid region (ÁT x ) up to 105 K and the largest value 0.428. However, the largest critical diameter is not achieved at x ¼ 2:5 but at x ¼ 5 instead, indicating a larger ÁT x and value does not necessarily mean a higher glass-forming ability. At x ¼ 10, no glass transition but crystallization takes place, suggesting too much Nb may promote crystallization. The compression test shows increasing Nb content increases the strength and reduces the plasticity of the Zr 62Àx Nb x Cu 15:4 Ni 12:6 Al 10 glassy alloy, which is apparently attributed to the decrease in the number of microstructural heterogeneities in the metallic glasses, resulting in much less severe multiplication and interaction of shear bands.

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High-strength Zr-Nb-(Cu,Ni,Al) composites with enhanced plasticity

Cited by 112 publications

References 15 publications

Formation of High Strength <I>In-situ</I> Bulk Metallic Glass Composite with Enhanced Plasticity in Cu<SUB>50</SUB>Zr<SUB>47.5</SUB>Ti<SUB>2.5</SUB> Alloy

Formation of High Strength <I>In-situ</I> Bulk Metallic Glass Composite with Enhanced Plasticity in Cu<SUB>50</SUB>Zr<SUB>47.5</SUB>Ti<SUB>2.5</SUB> Alloy

Impact of Microstructural Inhomogenities on the Ductility of Bulk Metallic Glasses

Formation, Thermal Stability and Mechanical Properties of Zr-Nb-Cu-Ni-Al Bulk Metallic Glasses

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