Limits...
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 characteristics of (a) W/V and (b) W/VNb5 composites, the inset shows the SAED pattern of the amorphous matrix, (c) High resolution TEM (HRTEM) image of the interface in W/VNb5 composite.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4355671&req=5

f5: Interfacial characteristics of (a) W/V and (b) W/VNb5 composites, the inset shows the SAED pattern of the amorphous matrix, (c) High resolution TEM (HRTEM) image of the interface in W/VNb5 composite.

Mentions: To prevent the formation of the crystals in the matrix and reduce the dissolution of the W fibers and the outer tube, lower infiltration temperature and shorter holding time (1123 K and 5 min) were carried out to fabricate the composite. Besides, alloys with different Nb contents were used as matrix. Figure 5 shows the microstructure of the composites. TEM bright field image (Figure 5(a)) shows slight intergranular erosion on the W fiber surface in the composite without Nb addition. While in the W/VNb5 composite, the fiber surface keeps smooth and flat, and the matrix is amorphous (Figure 5(b)). Besides, the high resolution TEM (HRTEM) image (Figure 5(c)) shows perfect interfacial bonding, which is expected to improve the mechanical properties of the interface and the composite.


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 characteristics of (a) W/V and (b) W/VNb5 composites, the inset shows the SAED pattern of the amorphous matrix, (c) High resolution TEM (HRTEM) image of the interface in W/VNb5 composite.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f5: Interfacial characteristics of (a) W/V and (b) W/VNb5 composites, the inset shows the SAED pattern of the amorphous matrix, (c) High resolution TEM (HRTEM) image of the interface in W/VNb5 composite.
Mentions: To prevent the formation of the crystals in the matrix and reduce the dissolution of the W fibers and the outer tube, lower infiltration temperature and shorter holding time (1123 K and 5 min) were carried out to fabricate the composite. Besides, alloys with different Nb contents were used as matrix. Figure 5 shows the microstructure of the composites. TEM bright field image (Figure 5(a)) shows slight intergranular erosion on the W fiber surface in the composite without Nb addition. While in the W/VNb5 composite, the fiber surface keeps smooth and flat, and the matrix is amorphous (Figure 5(b)). Besides, the high resolution TEM (HRTEM) image (Figure 5(c)) shows perfect interfacial bonding, which is expected to improve the mechanical properties of the interface and the composite.

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