Tribological Properties of Magnesium Composite with In-situ Formed Mg 2Si Dispersoids

Katsuyoshi Kondoh; Hideki Oginuma; Tatsuhiko Aizawa

Tribological Properties of Magnesium Composite with In-situ Formed Mg ₂Si Dispersoids

Katsuyoshi Kondoh, Hideki Oginuma, Tatsuhiko Aizawa

Materials Science and Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

The tribological properties of the magnesium composite alloys reinforced with solid-state synthesized Mg₂Si or Mg₂Si/MgO dispersoids are evaluated under wet and dry conditions by using pin on disc type wear test equipment. In the wet type wear test, every composites show a dependence of the friction coefficient on the applied load, which corresponds to Sribeck diagram based on elasto-hydrodynamic lubrication (EHL). The increase of Mg₂Si content causes the increase of both the friction coefficient and the total wear by plowing, because Mg₂Si dispersoids protruded from the surface are much harder than S35C mild steel counter material. When including MgO dispersoids formed in deoxidizing SiO₂ particles by magnesium, the friction coefficient reduces to 0.01-0.02 in oil lubricant. This is due to the "mild offensive effect" by MgO dispersoids which ease the attacking or plowing phenomenon on the counter material, because they are not so hard. In the dry type wear test when using the ADC12 aluminum alloy disks as the counter material, Mg₂Si and MgO dipsersoids also show the same effect to reduce the abrasive wear phenomenon. It is also clarified that the graphite particles embedded in the magnesium matrix prevent the fluctuation of the friction coefficient by the formation of the self-lubrication films between the pin and disk specimens.

Original language	English
Title of host publication	Affordable Metal Matrix Composites for High Performance Applications II
Editors	A.B. Pandey, K.L. Kendig, J.J. Lewandowski, S.S. Shah
Pages	91-101
Number of pages	11
Publication status	Published - 2003 Dec 1
Event	Materials Science and Technology 2003 Meeting - Chicago, IL, United States Duration: 2003 Nov 9 → 2003 Nov 12

Publication series

Name	Materials Science and Technology 2003 Meeting

Conference

Conference	Materials Science and Technology 2003 Meeting
Country/Territory	United States
City	Chicago, IL
Period	03/11/9 → 03/11/12

Keywords

Magnesium
MgO
MgSi
Mild Offensive
Self-lubricant
Solid-state Synthesis

ASJC Scopus subject areas

Materials Science(all)

Cite this

Tribological Properties of Magnesium Composite with In-situ Formed Mg ₂Si Dispersoids. / Kondoh, Katsuyoshi; Oginuma, Hideki; Aizawa, Tatsuhiko.
Affordable Metal Matrix Composites for High Performance Applications II. ed. / A.B. Pandey; K.L. Kendig; J.J. Lewandowski; S.S. Shah. 2003. p. 91-101 (Materials Science and Technology 2003 Meeting).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Kondoh, K, Oginuma, H & Aizawa, T 2003, Tribological Properties of Magnesium Composite with In-situ Formed Mg ₂Si Dispersoids. in AB Pandey, KL Kendig, JJ Lewandowski & SS Shah (eds), Affordable Metal Matrix Composites for High Performance Applications II. Materials Science and Technology 2003 Meeting, pp. 91-101, Materials Science and Technology 2003 Meeting, Chicago, IL, United States, 03/11/9.

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abstract = "The tribological properties of the magnesium composite alloys reinforced with solid-state synthesized Mg2Si or Mg2Si/MgO dispersoids are evaluated under wet and dry conditions by using pin on disc type wear test equipment. In the wet type wear test, every composites show a dependence of the friction coefficient on the applied load, which corresponds to Sribeck diagram based on elasto-hydrodynamic lubrication (EHL). The increase of Mg2Si content causes the increase of both the friction coefficient and the total wear by plowing, because Mg2Si dispersoids protruded from the surface are much harder than S35C mild steel counter material. When including MgO dispersoids formed in deoxidizing SiO2 particles by magnesium, the friction coefficient reduces to 0.01-0.02 in oil lubricant. This is due to the {"}mild offensive effect{"} by MgO dispersoids which ease the attacking or plowing phenomenon on the counter material, because they are not so hard. In the dry type wear test when using the ADC12 aluminum alloy disks as the counter material, Mg2Si and MgO dipsersoids also show the same effect to reduce the abrasive wear phenomenon. It is also clarified that the graphite particles embedded in the magnesium matrix prevent the fluctuation of the friction coefficient by the formation of the self-lubrication films between the pin and disk specimens.",

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N2 - The tribological properties of the magnesium composite alloys reinforced with solid-state synthesized Mg2Si or Mg2Si/MgO dispersoids are evaluated under wet and dry conditions by using pin on disc type wear test equipment. In the wet type wear test, every composites show a dependence of the friction coefficient on the applied load, which corresponds to Sribeck diagram based on elasto-hydrodynamic lubrication (EHL). The increase of Mg2Si content causes the increase of both the friction coefficient and the total wear by plowing, because Mg2Si dispersoids protruded from the surface are much harder than S35C mild steel counter material. When including MgO dispersoids formed in deoxidizing SiO2 particles by magnesium, the friction coefficient reduces to 0.01-0.02 in oil lubricant. This is due to the "mild offensive effect" by MgO dispersoids which ease the attacking or plowing phenomenon on the counter material, because they are not so hard. In the dry type wear test when using the ADC12 aluminum alloy disks as the counter material, Mg2Si and MgO dipsersoids also show the same effect to reduce the abrasive wear phenomenon. It is also clarified that the graphite particles embedded in the magnesium matrix prevent the fluctuation of the friction coefficient by the formation of the self-lubrication films between the pin and disk specimens.

AB - The tribological properties of the magnesium composite alloys reinforced with solid-state synthesized Mg2Si or Mg2Si/MgO dispersoids are evaluated under wet and dry conditions by using pin on disc type wear test equipment. In the wet type wear test, every composites show a dependence of the friction coefficient on the applied load, which corresponds to Sribeck diagram based on elasto-hydrodynamic lubrication (EHL). The increase of Mg2Si content causes the increase of both the friction coefficient and the total wear by plowing, because Mg2Si dispersoids protruded from the surface are much harder than S35C mild steel counter material. When including MgO dispersoids formed in deoxidizing SiO2 particles by magnesium, the friction coefficient reduces to 0.01-0.02 in oil lubricant. This is due to the "mild offensive effect" by MgO dispersoids which ease the attacking or plowing phenomenon on the counter material, because they are not so hard. In the dry type wear test when using the ADC12 aluminum alloy disks as the counter material, Mg2Si and MgO dipsersoids also show the same effect to reduce the abrasive wear phenomenon. It is also clarified that the graphite particles embedded in the magnesium matrix prevent the fluctuation of the friction coefficient by the formation of the self-lubrication films between the pin and disk specimens.

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