Mechanical properties of directionally solidified Nb-Mo-Si-based alloys with aligned Nbss/Nb5Si3 lamellar structure

Yulong Li; Chaoli Ma; Hu Zhang; Seiji Miura

doi:10.1016/j.msea.2011.04.011

Mechanical properties of directionally solidified Nb-Mo-Si-based alloys with aligned Nbss/Nb5Si3 lamellar structure

Yulong Li
, Chaoli Ma^*
, Hu Zhang
, Seiji Miura

^*Corresponding author for this work

School of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

55 Scopus citations

Abstract

The room-temperature fracture toughness and high-temperature compression strength are investigated in directionally solidified Nb-Mo-Si-based alloys with aligned Nb_ss/Nb₅Si₃ lamellar structure. The fracture toughness is higher as grain size is reduced or annealing at 1300°C for 100h is applied. The normalized work of rupture (χ_l) in the in situ Nb_ss/Nb₅Si₃ lamellar structure is modeled and calculated to range from 0.10 to 0.38. Besides, the Nb_ss and Nb₅Si₃ are firmly connected on the fracture surface. Thus, the Nb_ss/Nb₅Si₃ interface is strongly bonded. Either reducing interface toughness or enhancing Nb_ss toughness is advantageous for interface decohesion. In the annealed Nb-17Si-10Mo-0.1Ga alloy, a small amount of Nb_ss/Nb₅Si₃ interface decohesion is observed because the annealing increases the toughness of Nb_ss. At 1250°C and 1350°C, the maximum compression strength is 620MPa and 520MPa, respectively.

Original language	English
Pages (from-to)	5772-5777
Number of pages	6
Journal	Materials Science and Engineering: A
Volume	528
Issue number	18
DOIs	https://doi.org/10.1016/j.msea.2011.04.011
State	Published - 15 Jul 2011

Keywords

Casting
Interfaces
Intermetallics
Mechanical characterization

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10.1016/j.msea.2011.04.011

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title = "Mechanical properties of directionally solidified Nb-Mo-Si-based alloys with aligned Nbss/Nb5Si3 lamellar structure",

abstract = "The room-temperature fracture toughness and high-temperature compression strength are investigated in directionally solidified Nb-Mo-Si-based alloys with aligned Nbss/Nb5Si3 lamellar structure. The fracture toughness is higher as grain size is reduced or annealing at 1300°C for 100h is applied. The normalized work of rupture (χl) in the in situ Nbss/Nb5Si3 lamellar structure is modeled and calculated to range from 0.10 to 0.38. Besides, the Nbss and Nb5Si3 are firmly connected on the fracture surface. Thus, the Nbss/Nb5Si3 interface is strongly bonded. Either reducing interface toughness or enhancing Nbss toughness is advantageous for interface decohesion. In the annealed Nb-17Si-10Mo-0.1Ga alloy, a small amount of Nbss/Nb5Si3 interface decohesion is observed because the annealing increases the toughness of Nbss. At 1250°C and 1350°C, the maximum compression strength is 620MPa and 520MPa, respectively.",

keywords = "Casting, Interfaces, Intermetallics, Mechanical characterization",

author = "Yulong Li and Chaoli Ma and Hu Zhang and Seiji Miura",

year = "2011",

month = jul,

day = "15",

doi = "10.1016/j.msea.2011.04.011",

language = "英语",

volume = "528",

pages = "5772--5777",

journal = "Materials Science and Engineering: A",

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TY - JOUR

T1 - Mechanical properties of directionally solidified Nb-Mo-Si-based alloys with aligned Nbss/Nb5Si3 lamellar structure

AU - Li, Yulong

AU - Ma, Chaoli

AU - Zhang, Hu

AU - Miura, Seiji

PY - 2011/7/15

Y1 - 2011/7/15

N2 - The room-temperature fracture toughness and high-temperature compression strength are investigated in directionally solidified Nb-Mo-Si-based alloys with aligned Nbss/Nb5Si3 lamellar structure. The fracture toughness is higher as grain size is reduced or annealing at 1300°C for 100h is applied. The normalized work of rupture (χl) in the in situ Nbss/Nb5Si3 lamellar structure is modeled and calculated to range from 0.10 to 0.38. Besides, the Nbss and Nb5Si3 are firmly connected on the fracture surface. Thus, the Nbss/Nb5Si3 interface is strongly bonded. Either reducing interface toughness or enhancing Nbss toughness is advantageous for interface decohesion. In the annealed Nb-17Si-10Mo-0.1Ga alloy, a small amount of Nbss/Nb5Si3 interface decohesion is observed because the annealing increases the toughness of Nbss. At 1250°C and 1350°C, the maximum compression strength is 620MPa and 520MPa, respectively.

AB - The room-temperature fracture toughness and high-temperature compression strength are investigated in directionally solidified Nb-Mo-Si-based alloys with aligned Nbss/Nb5Si3 lamellar structure. The fracture toughness is higher as grain size is reduced or annealing at 1300°C for 100h is applied. The normalized work of rupture (χl) in the in situ Nbss/Nb5Si3 lamellar structure is modeled and calculated to range from 0.10 to 0.38. Besides, the Nbss and Nb5Si3 are firmly connected on the fracture surface. Thus, the Nbss/Nb5Si3 interface is strongly bonded. Either reducing interface toughness or enhancing Nbss toughness is advantageous for interface decohesion. In the annealed Nb-17Si-10Mo-0.1Ga alloy, a small amount of Nbss/Nb5Si3 interface decohesion is observed because the annealing increases the toughness of Nbss. At 1250°C and 1350°C, the maximum compression strength is 620MPa and 520MPa, respectively.

KW - Casting

KW - Interfaces

KW - Intermetallics

KW - Mechanical characterization

UR - https://www.scopus.com/pages/publications/79956292759

U2 - 10.1016/j.msea.2011.04.011

DO - 10.1016/j.msea.2011.04.011

M3 - 文章

AN - SCOPUS:79956292759

SN - 0921-5093

VL - 528

SP - 5772

EP - 5777

JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

IS - 18

ER -

Mechanical properties of directionally solidified Nb-Mo-Si-based alloys with aligned Nbss/Nb5Si3 lamellar structure

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Keywords

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