Sr microalloying for refining grain size of AZ91D Magnesium alloy

Yichuan Pan; Xiangfa Liu; Hua Yang

doi:10.1007/s11595-005-1074-6

Journal of Wuhan University of Technology Materials Science Edition ›› 2007, Vol. 22 ›› Issue (1) : 74 -76. DOI: 10.1007/s11595-005-1074-6

Article

Sr microalloying for refining grain size of AZ91D Magnesium alloy

Author information +

History +

PDF

Abstract

The grain refining process of an AZ91D Mg alloy by Sr addition was studied and the heterogeneous nucleating particles of α-Mg were investigated by electron probe microanalysis (EPMA). With 0.6 wt% Sr addition, the mean grain size of AZ91D alloy was refined from 235.4 μm to 52.5 μm at the one-half radius of the ingot. The morphology of primary crystal changed from a sixford symmetrical shape to a petal-like shape. Mg-Sr-Al-Fe-Mn heterogeneous nucleating particles were observed at the grain centers and Sr solute atoms presented segregation along the grain boundaries. Grain refinement was facilitated by both the Mg-Sr-Al-Fe-Mn nucleating particles and the Sr solute atoms, and the former played a dominate role in the process.

Keywords

AZ91D / Mg alloy / grain refinement / strontium / heterogeneous nucleation

Cite this article

Download citation ▾

Yichuan Pan, Xiangfa Liu, Hua Yang. Sr microalloying for refining grain size of AZ91D Magnesium alloy. Journal of Wuhan University of Technology Materials Science Edition, 2007, 22(1): 74-76 DOI:10.1007/s11595-005-1074-6

登录浏览全文

4963

注册一个新账户忘记密码

References

Publishing order | Descend order by publishing year | Descend order by cited within

[1]	Dahle A. K., StJohn D. H., Dunlop G. L. Developments and Challenges in the Utilization of Magnesium Alloys[J]. Mater. Forum, 2000, 24: 167-182.

[2]	Yano E., Tamura Y., Motegi T., . Effect of Carbon Powder on Grain Refinement of an AZ91E Magnesium Alloy[J]. Materials Transactions, 2003, 44: 107-110.

[3]	Jin Q., Eom J. P., Lim S. G., . Grain Refining Mechanism of a Carbon Addition Method in a Mg-Al Magnesium Alloy[J]. Scripta Materialia, 2003, 49: 1 129-1 132.

[4]	Lee Y. C., Dahle A. K., StJohn D. H. The Role of Solute in Grain Refinement of Magnesium[J]. Metall. Mater. Trans. A, 2000, 31: 2 895-2 905.

[5]	Nussbaum G., Bridot P., Warner T. J., . Mordike B.L., Hehmann, . Magnesium Alloys and Their Applications[M], 1992. Oberursel: Gamisch-Partenkirchen, DMG Informationsgesellshaft. 351-58.

[6]	Dahle A. K., Lee Y. C., Nave M. D., . Development of the As-cast Microstructure in Magnesium-aluminum Alloys[J]. J. Light. Metals, 2001, 1: 61-72.

[7]	Hutt J. E. C., StJohn D. H., Hogan L., . Equiaxed Solidification of Al-Si Alloys[J]. Mater. Sci. Technol., 1999, 15(5): 495-500.

[8]	Hutt J E C, Dahle A K, LEE Y C, et al. Light Metals 1999[C]. in: C.E. Eckert (Ed.), The Minerals, Metals and Materials Society (TMS), Warrendale, PA, USA, 1999

[9]	Easton M., StJohn D. Grain Refinement of Aluminum Alloys: Part II. Confirmation of, and a Mechanism for, the Solute Paradigm[J]. Metall.Mater. Trans. A, 1999, 30: 1 625-1 633.