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Atomic interaction mechanism for designing the interface of W/Zr-based bulk metallic glass composites.

Li ZK, Fu HM, Sha PF, Zhu ZW, Wang AM, Li H, Zhang HW, Zhang HF, Hu ZQ - Sci Rep (2015)

Bottom Line: Besides, the atomic interaction mechanism was proven to be effective in many other systems by the sessile drop technique.Considering the interfacial morphology, Nb was added into the alloy to fabricate W/Zr-based BMGCs.Both the compressive and tensile properties are improved obviously.

View Article: PubMed Central - PubMed

Affiliation: 1] Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang. 110016, China [2] University of Chinese Academy of Sciences, Beijing. 100049, China.

ABSTRACT
The interaction between active element Zr and W damages the W fibers and the interface and decreases the mechanical properties, especially the tensile strength of the W fibers reinforced Zr-based bulk metallic glass composites (BMGCs). From the viewpoint of atomic interaction, the W-Zr interaction can be restrained by adding minor elements that have stronger interaction with W into the alloy. The calculation about atomic interaction energy indicates that Ta and Nb preferred to segregate on the W substrate surface. Sessile drop experiment proves the prediction and corresponding in-situ coating appears at the interface. Besides, the atomic interaction mechanism was proven to be effective in many other systems by the sessile drop technique. Considering the interfacial morphology, Nb was added into the alloy to fabricate W/Zr-based BMGCs. As expected, the Nb addition effectively suppressed the W-Zr reaction and damage to W fibers. Both the compressive and tensile properties are improved obviously.

No MeSH data available.


Related in: MedlinePlus

Interfacial SEM images of (a) V, (b) VTa5 and (c) VNb5 alloys on W substrates. The inset is the enlarged view of the interface. (d) EDS scanning along the black line from top to bottom in the inset of (c).
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f2: Interfacial SEM images of (a) V, (b) VTa5 and (c) VNb5 alloys on W substrates. The inset is the enlarged view of the interface. (d) EDS scanning along the black line from top to bottom in the inset of (c).

Mentions: Given the advantage on interface study, sessile drop method262728 was introduced to research the effect of elements addition. The differential scanning calorimetry (DSC) results of V, VNb5 and VTa5 alloys indicates that the liquidus temperatures are 990 ± 5 K. Therefore, the alloys were heated to 1273 K on W substrates and held for 30 min. The morphology of the cross section perpendicular to the interface is shown in Figure 2. Severe reaction occurs at the interface in the original W/V alloy system (Figure 2(a)). The EDS analysis shows that the irregular reaction product (indicated by the black arrows) is W-Zr phase. The surface of the W substrate is eroded obviously and numerous wide erosion ditches emerge on the W surface. This agrees well with the discussion before that active element Zr causes great damage to W fiber and composite's interface.


Atomic interaction mechanism for designing the interface of W/Zr-based bulk metallic glass composites.

Li ZK, Fu HM, Sha PF, Zhu ZW, Wang AM, Li H, Zhang HW, Zhang HF, Hu ZQ - Sci Rep (2015)

Interfacial SEM images of (a) V, (b) VTa5 and (c) VNb5 alloys on W substrates. The inset is the enlarged view of the interface. (d) EDS scanning along the black line from top to bottom in the inset of (c).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4355671&req=5

f2: Interfacial SEM images of (a) V, (b) VTa5 and (c) VNb5 alloys on W substrates. The inset is the enlarged view of the interface. (d) EDS scanning along the black line from top to bottom in the inset of (c).
Mentions: Given the advantage on interface study, sessile drop method262728 was introduced to research the effect of elements addition. The differential scanning calorimetry (DSC) results of V, VNb5 and VTa5 alloys indicates that the liquidus temperatures are 990 ± 5 K. Therefore, the alloys were heated to 1273 K on W substrates and held for 30 min. The morphology of the cross section perpendicular to the interface is shown in Figure 2. Severe reaction occurs at the interface in the original W/V alloy system (Figure 2(a)). The EDS analysis shows that the irregular reaction product (indicated by the black arrows) is W-Zr phase. The surface of the W substrate is eroded obviously and numerous wide erosion ditches emerge on the W surface. This agrees well with the discussion before that active element Zr causes great damage to W fiber and composite's interface.

Bottom Line: Besides, the atomic interaction mechanism was proven to be effective in many other systems by the sessile drop technique.Considering the interfacial morphology, Nb was added into the alloy to fabricate W/Zr-based BMGCs.Both the compressive and tensile properties are improved obviously.

View Article: PubMed Central - PubMed

Affiliation: 1] Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang. 110016, China [2] University of Chinese Academy of Sciences, Beijing. 100049, China.

ABSTRACT
The interaction between active element Zr and W damages the W fibers and the interface and decreases the mechanical properties, especially the tensile strength of the W fibers reinforced Zr-based bulk metallic glass composites (BMGCs). From the viewpoint of atomic interaction, the W-Zr interaction can be restrained by adding minor elements that have stronger interaction with W into the alloy. The calculation about atomic interaction energy indicates that Ta and Nb preferred to segregate on the W substrate surface. Sessile drop experiment proves the prediction and corresponding in-situ coating appears at the interface. Besides, the atomic interaction mechanism was proven to be effective in many other systems by the sessile drop technique. Considering the interfacial morphology, Nb was added into the alloy to fabricate W/Zr-based BMGCs. As expected, the Nb addition effectively suppressed the W-Zr reaction and damage to W fibers. Both the compressive and tensile properties are improved obviously.

No MeSH data available.


Related in: MedlinePlus