Effect of Sr addition on fracture characteristics of high purity AI-Si-Mg type casting alloy

Toshiro Kobayashi; Mitsuo Niinomi; Michimasa Yamaoka; Toshihiro Harata; Mahmoud Fouad HAFIZ

doi:10.2464/jilm.43.472

Effect of Sr addition on fracture characteristics of high purity AI-Si-Mg type casting alloy

Toshiro Kobayashi, Mitsuo Niinomi, Michimasa Yamaoka, Toshihiro Harata, Mahmoud Fouad HAFIZ

Materials Development Division

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

13 Citations (Scopus)

Abstract

The effect of strontium (Sr) modification on the fracture characteristics is investigated in high purity Al-Si-Mg typecasting alloy, AC4CH. The Charpy absorbed energy, static fracture toughness and dynamic fracture toughness of AC₄CH are improved by the addition of Srassociated with the refinement and spheroidizing of needle like eutectic Si, which results in the relaxation of stress concentration of the eutectic Si. The cohesion of eutectic Si and porosity increase with increasing Sr addition. The larger size eutectic Si particles increase again with increasing Sr addition over 50ppm. These three factors seem to be the causes for decreasing dynamic toughness of AC4CH at 200ppm Sr addition comparing with 100ppm Sr addition.

Original language	English
Pages (from-to)	472-477
Number of pages	6
Journal	journal of japan institute of light metals
Volume	43
Issue number	9
DOIs	https://doi.org/10.2464/jilm.43.472
Publication status	Published - 1993 Feb

Keywords

Charpy absorbed energy
Sr modification
aluminum casting alloy AC4CH
dynamic fracture toughness

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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abstract = "The effect of strontium (Sr) modification on the fracture characteristics is investigated in high purity Al-Si-Mg typecasting alloy, AC4CH. The Charpy absorbed energy, static fracture toughness and dynamic fracture toughness of AC4CH are improved by the addition of Srassociated with the refinement and spheroidizing of needle like eutectic Si, which results in the relaxation of stress concentration of the eutectic Si. The cohesion of eutectic Si and porosity increase with increasing Sr addition. The larger size eutectic Si particles increase again with increasing Sr addition over 50ppm. These three factors seem to be the causes for decreasing dynamic toughness of AC4CH at 200ppm Sr addition comparing with 100ppm Sr addition.",

keywords = "Charpy absorbed energy, Sr modification, aluminum casting alloy AC4CH, dynamic fracture toughness",

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AU - Kobayashi, Toshiro

AU - Niinomi, Mitsuo

AU - Yamaoka, Michimasa

AU - Harata, Toshihiro

AU - Fouad HAFIZ, Mahmoud

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N2 - The effect of strontium (Sr) modification on the fracture characteristics is investigated in high purity Al-Si-Mg typecasting alloy, AC4CH. The Charpy absorbed energy, static fracture toughness and dynamic fracture toughness of AC4CH are improved by the addition of Srassociated with the refinement and spheroidizing of needle like eutectic Si, which results in the relaxation of stress concentration of the eutectic Si. The cohesion of eutectic Si and porosity increase with increasing Sr addition. The larger size eutectic Si particles increase again with increasing Sr addition over 50ppm. These three factors seem to be the causes for decreasing dynamic toughness of AC4CH at 200ppm Sr addition comparing with 100ppm Sr addition.

AB - The effect of strontium (Sr) modification on the fracture characteristics is investigated in high purity Al-Si-Mg typecasting alloy, AC4CH. The Charpy absorbed energy, static fracture toughness and dynamic fracture toughness of AC4CH are improved by the addition of Srassociated with the refinement and spheroidizing of needle like eutectic Si, which results in the relaxation of stress concentration of the eutectic Si. The cohesion of eutectic Si and porosity increase with increasing Sr addition. The larger size eutectic Si particles increase again with increasing Sr addition over 50ppm. These three factors seem to be the causes for decreasing dynamic toughness of AC4CH at 200ppm Sr addition comparing with 100ppm Sr addition.

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