论文信息 - FABRICATION OF MAGNESIUM ALLOY FROM A PRE-ALLOYED POWDER USING HOT DIE COMPACTION PROCESS

FABRICATION OF MAGNESIUM ALLOY FROM A PRE-ALLOYED POWDER USING HOT DIE COMPACTION PROCESS

AZ91D magnesium alloy was fabricated by using pre-alloyed powder compressed without any binder agent at 280C under the compaction pressure of 200 MPa at different time intervals of 2, 4, 6, 8 and 10 hours. Some of the compressed samples were then undergone a sintering process at temperature of 450C for 3 and 6 hours. Furnace cooling was performed after the sintering. Microstructure and hardness of each specimen were investigated. The microstructures observation and hardness investigation of the as-hot compacted and sintered samples were then compared. The results showed that microstructure transformation occurred due to the hot compaction and the sintering for 3 and 6 hours. The as-hot compacted samples showed a grown globular precipitates (β phase, Mg17Al12) distributed uniformly in grains. However, after sintering process, lamellar precipitates took place and dominated the grains. The as-hot compacted sample showed higher hardness value compared to the 3 hours and 6 hours sintered samples.

M. Daud | J. Syarif | Z. Sajuri | Z. Zulkoffli

[1] Chen Lu,et al. Influence of Mg17Al12 intermetallic compounds on the hot extruded microstructures and mechanical properties of Mg–9Al–1Zn alloy , 2007 .

[2] J. Bi,et al. Influence of sintering routes to the mechanical properties of magnesium alloy and its composites produced by PM technique , 2007 .

[3] Zhimao Yang,et al. Microstructure and tensile strength of PM304 composite , 2007 .

[4] J. Lo,et al. Microstructure and tensile properties of squeeze cast magnesium alloy AM50 , 2005 .

[5] D. Hamana,et al. Kinetics and mechanism of formation and transformation of metastable β′-phase in Al–Mg alloys , 2004 .

[6] Y. Miyashita,et al. Fatigue‐Life Prediction of Magnesium Alloys for Structural Applications , 2003 .

[7] M. Zheng,et al. Aging behavior of squeeze cast SiCw/AZ91 magnesium matrix composite , 2003 .

[8] H. Friedrich,et al. The Art of Developing New Magnesium Alloys for High Temperature Applications , 2003 .

[9] S. Kamado,et al. Development of Heat Resistant Mg-Zn-Al-Ca-RE Diecasting Alloys , 2003 .

[10] K. Ho,et al. Non-basal slip systems in HCP metals and alloys: source mechanisms , 2001 .

[11] B. Mordike,et al. Magnesium: Properties — applications — potential , 2001 .

[12] L. Duffy. Magnesium alloys : the light choice for aerospace , 1996 .

[13] G. S. Cole,et al. Light weight materials for automotive applications , 1995 .