Fracture mechanism and micromechanical analysis of polysynthetically twinned crystals of γ-tiai alloys

Y. G. Zhang; Y. H. Lu; G. K. Hu; C. Q. Chen

Fracture mechanism and micromechanical analysis of polysynthetically twinned crystals of γ-tiai alloys

Y. G. Zhang^*, Y. H. Lu, G. K. Hu, C. Q. Chen

^*Corresponding author for this work

School of Aerospace Engineering

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

1 Citation (Scopus)

Abstract

The fracture behavior and mechanism of PST crystals of a Ti-49% (mole fraction)Al alloy have been studied by using in-situ straining and micromechanical calculation. The three-dimensional micromechanical model representing the structure of PST crystal has been built, and the stress distribution ahead of the sharp and blunt crack tips either parallel to lamellar interface or perpendicular to the lamellae has been calculated by using finite element method based on linear elasticity of PST crystals. The experimental results show that the fracture behaviors and mechanisms are strongly dependent on the angle of loading axis to the lamellae. The calculation indicates that nucleation and propagation of microcrack along the interfaces are controlled by the normal stress and translamellar microcrack is controlled by shear stress ahead of crack tip.

Original language	English
Pages (from-to)	136-137
Number of pages	2
Journal	Transactions of Nonferrous Metals Society of China (English Edition)
Volume	9
Issue number	SUPPL. 1
Publication status	Published - 1999

Keywords

Crystal fracture behavior
Element method
Mechanism micromechanical
Model finite
PST
Tial alloy

Cite this

Zhang, Y. G., Lu, Y. H., Hu, G. K., & Chen, C. Q. (1999). Fracture mechanism and micromechanical analysis of polysynthetically twinned crystals of γ-tiai alloys. Transactions of Nonferrous Metals Society of China (English Edition), 9(SUPPL. 1), 136-137.

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title = "Fracture mechanism and micromechanical analysis of polysynthetically twinned crystals of γ-tiai alloys",

abstract = "The fracture behavior and mechanism of PST crystals of a Ti-49% (mole fraction)Al alloy have been studied by using in-situ straining and micromechanical calculation. The three-dimensional micromechanical model representing the structure of PST crystal has been built, and the stress distribution ahead of the sharp and blunt crack tips either parallel to lamellar interface or perpendicular to the lamellae has been calculated by using finite element method based on linear elasticity of PST crystals. The experimental results show that the fracture behaviors and mechanisms are strongly dependent on the angle of loading axis to the lamellae. The calculation indicates that nucleation and propagation of microcrack along the interfaces are controlled by the normal stress and translamellar microcrack is controlled by shear stress ahead of crack tip.",

keywords = "Crystal fracture behavior, Element method, Mechanism micromechanical, Model finite, PST, Tial alloy",

author = "Zhang, {Y. G.} and Lu, {Y. H.} and Hu, {G. K.} and Chen, {C. Q.}",

year = "1999",

language = "English",

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pages = "136--137",

journal = "Transactions of Nonferrous Metals Society of China (English Edition)",

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TY - JOUR

T1 - Fracture mechanism and micromechanical analysis of polysynthetically twinned crystals of γ-tiai alloys

AU - Zhang, Y. G.

AU - Lu, Y. H.

AU - Hu, G. K.

AU - Chen, C. Q.

PY - 1999

Y1 - 1999

N2 - The fracture behavior and mechanism of PST crystals of a Ti-49% (mole fraction)Al alloy have been studied by using in-situ straining and micromechanical calculation. The three-dimensional micromechanical model representing the structure of PST crystal has been built, and the stress distribution ahead of the sharp and blunt crack tips either parallel to lamellar interface or perpendicular to the lamellae has been calculated by using finite element method based on linear elasticity of PST crystals. The experimental results show that the fracture behaviors and mechanisms are strongly dependent on the angle of loading axis to the lamellae. The calculation indicates that nucleation and propagation of microcrack along the interfaces are controlled by the normal stress and translamellar microcrack is controlled by shear stress ahead of crack tip.

AB - The fracture behavior and mechanism of PST crystals of a Ti-49% (mole fraction)Al alloy have been studied by using in-situ straining and micromechanical calculation. The three-dimensional micromechanical model representing the structure of PST crystal has been built, and the stress distribution ahead of the sharp and blunt crack tips either parallel to lamellar interface or perpendicular to the lamellae has been calculated by using finite element method based on linear elasticity of PST crystals. The experimental results show that the fracture behaviors and mechanisms are strongly dependent on the angle of loading axis to the lamellae. The calculation indicates that nucleation and propagation of microcrack along the interfaces are controlled by the normal stress and translamellar microcrack is controlled by shear stress ahead of crack tip.

KW - Crystal fracture behavior

KW - Element method

KW - Mechanism micromechanical

KW - Model finite

KW - PST

KW - Tial alloy

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M3 - Article

AN - SCOPUS:33746700849

SN - 1003-6326

VL - 9

SP - 136

EP - 137

JO - Transactions of Nonferrous Metals Society of China (English Edition)

JF - Transactions of Nonferrous Metals Society of China (English Edition)

IS - SUPPL. 1

ER -

Fracture mechanism and micromechanical analysis of polysynthetically twinned crystals of γ-tiai alloys

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