Effect of thermal degradation on mechanical properties of cast Al-Si alloys for cylinder heads

Peirong Ren; Chengzhang Zhao; Zhengxing Zuo; Youfu Shui; Dongwei Li; Weiqing Huang

doi:10.1016/j.engfracmech.2023.109200

Effect of thermal degradation on mechanical properties of cast Al-Si alloys for cylinder heads

Peirong Ren, Chengzhang Zhao, Zhengxing Zuo, Youfu Shui, Dongwei Li, Weiqing Huang^*

^*Corresponding author for this work

School of Mechanical Engineering

Beijing Institute of Technology

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

2 Citations (Scopus)

Abstract

The effect of thermal degradation on mechanical properties of cast Al-Si alloys for cylinder heads is investigated. Thermal degradation has a significant deteriorating effect on the tensile strength caused by the coarsening and coalescence of the θ phase (Al₂Cu) due to precipitation reaction. The dominant factor for degradation at 250 ℃ is exposure temperature, while exposure time has a greater effect at 200 ℃. Thermal degradation increases the long crack growth rate significantly due to the increase in plasticity scale ahead of the crack tip. The effective stress intensity factor range (ΔK_eff) is modified for thermally exposed alloys by adding the plasticity zone size to the crack length and considering the reduction in crack resistance from the precipitates.

Original language	English
Article number	109200
Journal	Engineering Fracture Mechanics
Volume	283
DOIs	https://doi.org/10.1016/j.engfracmech.2023.109200
Publication status	Published - 28 Apr 2023

Keywords

Cast Al-Si alloy
Crack
Mechanical properties
Thermal degradation

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10.1016/j.engfracmech.2023.109200

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title = "Effect of thermal degradation on mechanical properties of cast Al-Si alloys for cylinder heads",

abstract = "The effect of thermal degradation on mechanical properties of cast Al-Si alloys for cylinder heads is investigated. Thermal degradation has a significant deteriorating effect on the tensile strength caused by the coarsening and coalescence of the θ phase (Al2Cu) due to precipitation reaction. The dominant factor for degradation at 250 ℃ is exposure temperature, while exposure time has a greater effect at 200 ℃. Thermal degradation increases the long crack growth rate significantly due to the increase in plasticity scale ahead of the crack tip. The effective stress intensity factor range (ΔKeff) is modified for thermally exposed alloys by adding the plasticity zone size to the crack length and considering the reduction in crack resistance from the precipitates.",

keywords = "Cast Al-Si alloy, Crack, Mechanical properties, Thermal degradation",

author = "Peirong Ren and Chengzhang Zhao and Zhengxing Zuo and Youfu Shui and Dongwei Li and Weiqing Huang",

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T1 - Effect of thermal degradation on mechanical properties of cast Al-Si alloys for cylinder heads

AU - Ren, Peirong

AU - Zhao, Chengzhang

AU - Zuo, Zhengxing

AU - Shui, Youfu

AU - Li, Dongwei

AU - Huang, Weiqing

PY - 2023/4/28

Y1 - 2023/4/28

N2 - The effect of thermal degradation on mechanical properties of cast Al-Si alloys for cylinder heads is investigated. Thermal degradation has a significant deteriorating effect on the tensile strength caused by the coarsening and coalescence of the θ phase (Al2Cu) due to precipitation reaction. The dominant factor for degradation at 250 ℃ is exposure temperature, while exposure time has a greater effect at 200 ℃. Thermal degradation increases the long crack growth rate significantly due to the increase in plasticity scale ahead of the crack tip. The effective stress intensity factor range (ΔKeff) is modified for thermally exposed alloys by adding the plasticity zone size to the crack length and considering the reduction in crack resistance from the precipitates.

AB - The effect of thermal degradation on mechanical properties of cast Al-Si alloys for cylinder heads is investigated. Thermal degradation has a significant deteriorating effect on the tensile strength caused by the coarsening and coalescence of the θ phase (Al2Cu) due to precipitation reaction. The dominant factor for degradation at 250 ℃ is exposure temperature, while exposure time has a greater effect at 200 ℃. Thermal degradation increases the long crack growth rate significantly due to the increase in plasticity scale ahead of the crack tip. The effective stress intensity factor range (ΔKeff) is modified for thermally exposed alloys by adding the plasticity zone size to the crack length and considering the reduction in crack resistance from the precipitates.

KW - Cast Al-Si alloy

KW - Crack

KW - Mechanical properties

KW - Thermal degradation

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DO - 10.1016/j.engfracmech.2023.109200

M3 - Article

AN - SCOPUS:85151275910

SN - 0013-7944

VL - 283

JO - Engineering Fracture Mechanics

JF - Engineering Fracture Mechanics

M1 - 109200

ER -

Effect of thermal degradation on mechanical properties of cast Al-Si alloys for cylinder heads

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