Effects of B and Si on the fracture toughness of the Nb–Si alloys

Sun, Zhenzhen; Guo, Xiping; Tian, Xiaodong; Zhou, Liang

doi:10.1016/j.intermet.2014.06.005

Cited by 27 publications

(4 citation statements)

References 11 publications

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“…The addition of 9 at%Al significantly improves fracture toughness to 11.1 MPa• m 1/2 , which is partly cooperated by the substitution of Si by metallic Al, as listed for the composition of Nb 5 Si 3 in Table 1. This value is close to those tested from the as-cast Nb-18Ti-14Si-4.5B alloy and the directionally solidified Nb-10Mo-17Si-0.1Ga alloy [15,16] . Obviously these values are not satisfactory for aerospace applications.…”

Section: Methodssupporting

confidence: 85%

“…Fracture toughness of 11.1 MPa• m 1/2 is obtained for A2 alloy, as listed in Table 2. The fracture toughness of 7.85 MPa• m 1/2 has been reported for the as-cast Nb-18Ti-14Si [15] . The addition of 9 at%Al significantly improves fracture toughness to 11.1 MPa• m 1/2 , which is partly cooperated by the substitution of Si by metallic Al, as listed for the composition of Nb 5 Si 3 in Table 1.…”

Section: Methodsmentioning

confidence: 80%

“…2) The fracture toughness of Nb-18Ti-14Si [15] , Nb-18Ti-14Si-9Al (A2) and Nb-21Ti-14Si-9Al (A4) is 7.85, 11.1 and 10.9 MPa• m 1/2 , respectively. The addition of 9at%Al significantly improves the fracture toughness of Nb-Si alloys.…”

Section: Discussionmentioning

confidence: 99%

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Effect of Ti and Al Interaction on Microstructures and Mechanical Properties of the Nb-Ti-Si-Al Alloys

Sun

Guo

Chen³

et al. 2016

Rare Metal Materials and Engineering

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Nb-Si based alloys show great promise to surpass currently advanced Ni-base superalloys due to their low densities and high melting points. Both Ti and Al are beneficial alloying elements for Nb-Si based alloys. In literatures, a small amount (≤ 3 at%) of Al can be frequently examined, while Nb aluminides are usually not formed in this case. Since Nb3Al and Nb2Al have good strength and creep properties, NbAl3 is also a candidate hot-section material; however the study of Nb-Si alloys with these possible Nb aluminides is lacking, so we focus our efforts on whether Nb aluminide is formed or not by adding more Al in the as-cast Nb-Ti-Si alloys. The microstructures and the mechanical properties of two Nb-Ti-Si-Al alloys (A2: Nb-18Ti-14Si-9Al, A4: Nb-21Ti-14Si-9Al) with higher Al content were studied in the present work. A4 alloy was designed to examine the alloying effect of more Ti. Results show that A2 alloy consists of (Nb), Nb5Si3 and Nb3Al, while the A4 alloy is composed of (Nb) and Nb5Si3. The room temperature fracture toughnesses of A2 alloy and A4 alloy are 11.1 and 10.9 MPa• m 1/2 , respectively. Moreover, the microindention tests were conducted to characterize the micro scale mechanical properties of these Nb-Ti-Si-Al alloys.

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Section: Methodssupporting

confidence: 85%

Section: Methodsmentioning

confidence: 80%

See 1 more Smart Citation

Effect of Ti and Al Interaction on Microstructures and Mechanical Properties of the Nb-Ti-Si-Al Alloys

Sun

Guo

Chen³

et al. 2016

Rare Metal Materials and Engineering

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“…Alloying is one critical method to improve the mechanical properties of Nb-Si based alloy [5][6]. The previous studies were focused on the macro alloying such as Hf, Zr, Mg, Zn and so on [7][8][9][10][11]. But it is few about the tiny alloying for Nb-Si based alloys.…”

Section: Introductionmentioning

confidence: 99%

Effect of Trace Ce and B Additions on the Mechanical Properties of Nb-3Si-22Ti Alloys

Guo

et al. 2017

MSF

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The Nb-Si system ultrahigh temperature alloys were prepared by vacuum non-consumable arc melting. The influence of micro-alloying elements of B and Ce on the hardness, room-temperature fracture toughness and compressive strength at 1250°C of the Nb-22Ti-3Si alloys was investigated and estimated systematically. The results showed that the hardness of the Nb-22Ti-3Si alloy increased obviously with trace B addition, but decreased slightly with trace Ce addition. The room-temperature fracture toughness of the Nb-22Ti-3Si alloy was degraded by the Ce addition but improved by the trace addition of B. The trace addition of B improved the compressive strength of the alloy at 1250°C. In contrast, the trace Ce addition degraded the compressive strength at 1250°C. The relationship between the microstructure and the mechanical properties was discussed.

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Microstructure and Properties of Nb/Nb5Si3 Composites Strengthened with Multiwalled Carbon Nanotubes by SPS

Long

Zeng²,

Jia

2019

Trans Indian Inst Met

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Effects of B and Si on the fracture toughness of the Nb–Si alloys

Cited by 27 publications

References 11 publications

Effect of Ti and Al Interaction on Microstructures and Mechanical Properties of the Nb-Ti-Si-Al Alloys

Effect of Ti and Al Interaction on Microstructures and Mechanical Properties of the Nb-Ti-Si-Al Alloys

Effect of Trace Ce and B Additions on the Mechanical Properties of Nb-3Si-22Ti Alloys

Microstructure and Properties of Nb/Nb5Si3 Composites Strengthened with Multiwalled Carbon Nanotubes by SPS

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