Influence of Inclusions on Fatigue Characteristics of Non-Combustible Mg Alloy

Abstract:

It is common knowledge that Mg is very light and high specific strength material. But there is a problem that Mg alloy easily burns during its machining, because the ignition point of Mg is 700K.[1] The ignition point of new Mg alloy to which Ca is added is about 1000K. This new Mg alloy is called non-combustible Mg alloy. As a result, many inclusions exist in Mg alloy. Then, fatigue test was carried out and gave evidence that inclusions have an effect on the fatigue strength. Then relationships between size of inclusions and fatigue limit were drawn. Therefore, the fatigue limit can be predicted by estimating the maximum inclusion size. The method of estimating the maximum inclusion size is “Estimation for particle size distribution in materials“[2] .

• Periodical: Materials Science Forum (Volume 482)
• Pages: 359-362
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.482.359
• Online since: April 2005
• Authors: Y. Kitahara, H. Shimazaki, T. Yabu, Hiroshi Noguchi, Michiru Sakamoto, Hideto Ueno
• Keywords: Fatigue Limit, Inclusion, Non-Combustible, Statistics

References

[1] The Japan Magnesium Association, Handbook of Advanced Magnesium Tecnhology (2000).

[2] A. Hashimoto, T. Miyazaki and etc., Journal of Testing and Evaluation, 28, 9, 367-377(May 2000).

[3] Y. Murakami, Metal Fatigue: Effects of Small Defects and Inclusions, Elsevier, Oxford, 2002. ｒ R 100 120 140 160 AZX312D(X=Ca) AZX912D(X=Ca) AMX602B(X=Ca) V=57mm.

[3] Fatigue survival rate p[%] Fatigue limit σw[MPa].

[20] [40] [60] [80] 100 V0=57 mm3.

10 20 30 40 50 60 -4 -2.

[2] [4] r[µm] ln(MA */r 0. 5 ) AZX312D(X=Ca) AZX912D(X=Ca) AMX602B(X=Ca).

[50] 100 150.

0. 2 0. 4 0. 6 0. 8.

[1] Fvmax[%] R [µm] V0=57mm3 AZX312D(X=Ca) AZX912D(X=Ca) AMX602B(X=Ca) A0=133mm2.