New Mg₂Si based alloy for automobile engine cylinder liner

Abstract

New Mg₂Si based alloy were prepared by mechanical alloying. Sintering temperature was from 825 to 865K, which indicated that few Mg₂Si were produced at lower temperature while MgO were produced at higher temperature. Microstructure image showed that at sintering temperature of 855K, Mg₂Si were mostly synthesized with the reaction of purity magnesia powder and silicon powder. Hardness and wear tests proved that the new synthetic silicon magnesium alloy had higher hardness and good wear resistance. Under the same testing conditions, it is found that the hardness of the new material is 420.50, and pure magnesium is only 41.65.In the same experiments it is also found that under the same pressure, pure magnesium alloys than silicon wearing capacity of pure magnesium is 2 times as high that of Mg₂Si based alloy. It shows that Mg₂Si based alloy is the ideal material for the wear parts of car engine cylinder liner because of its small density, stable dimension, high hardness and wear-resisting.

Keywords

cylinder liner / Mg₂Si based alloy / hardness / wear-resisting

References

[1] Mordike B. L., Ebert T. Magnesium Properties-applications-potential [J]. Materials Science and Engineering, 2001, A302: 37-45.

[2] Mordike B.L., Ebert T. Magnesium, Properties-applicationspotential[J]. Materials Science and Engineering A, 2001, 302: 37-45.

[3] Rtffel M., Schilz J. Mechanical Alloying of Mg₂Si[J]. Scripta Metallurgical Materialia, 1995, 32(12): 1951-1956.

[4] Yoshinaga M., Iida T., Noda M., . Bulk Crystal Growth of Mg₂Si by the vertical Bridgman Method[J]. Thin Solid Films, 2004, 461: 86-89.

[5] Tatsuoka H., Takagii N., Okaya S., . Microstructures of Semiconducting Silicide Layers Grown by Novel Growth Techniques[J]. Thin Solid Films, 2004, 461: 57-62.

[6] Folland N. O. Self-Consistent Calculations of the Energy Band Structure of Mg₂Si[J]. Physical Review, 1967, 158: 764-775.

[7] Wood D. M., Zunger A. Electronic Structure of Generic Semiconductors: Antifluorite Silicide and III–V compounds[J]. Physical Review B (Condensed Matter), 1986, 34: 4105-4120.

[8] Arnaud B., Alouani M. All-electron Projector-augmented-wave GW Approximation: Application to the Electronic Properties of Semiconductors[J]. Physical Review B(Condensed Matter and Materials Physics), 2000, 62: 4 464-4 476.

[9] Arnaud B., Alouani M. Electron-hole Excitations in Mg₂Si and Mg₂Ge compounds[J]. Physical Review B, 2001, 64(03): 3202

[10] Imai Y., Watanabe A., Mukaida M. Electronic Structures of Semiconducting Alkaline-earth Metal Silicides[J]. Journal of Alloys and Compounds, 2003, 358: 257-263.

[11] Lu L., Lai M. O., Hoe M. L. Formation of Nanocrystalline Mg₂Si Disspersion Strengthened Mg-Al Alloy by Mechanical Alloying [J]. Nano Structure Materrials, 1998, 10(4): 551-563.

[12] Mabuchi M., Kubota K., Higashi K. Effect of Hot Extrusion on Mechanical Properties of Mg-Si-Al Alloy[J]. Materials Letters, 1994, 19: 247-250.

[13] Mabuchi M., Kubota K., Higashi K. High Strength and High Strain Rate Superplasticity in a Mg-Mg₂Si Composite[J]. Scripta Metallurgical Materials, 1995, 33: 331-335.