Influence of lanthanum on the microstructure, mechanical property and corrosion resistance of magnesium alloy
- 340 Downloads
The microstructure, mechanical property and corrosion behavior of AZ91D with addition of lanthanum were investigated. With adding 1% lanthanum, the ultimate tensile strength and the elongation increased by 21.1% and by 101.2%, respectively. This mainly caused by the refinement of the β phase and the formation of Al11La3 strengthening phase. With adding 1% lanthanum in AZ91D alloy, the weight loss corrosion rate decreased to 47.2%. But when lanthanum content is over 1%, the corrosion rate increased. Small amount of lanthanum could form the small β phase similar to reticular structure, which could restrain the corrosion at some extent; large amount of lanthanum caused the depletion of aluminum in α matrix, which increased the corrosion rate.
KeywordsCorrosion Rate Lanthanum Magnesium Alloy Ultimate Tensile Strength Polarization Curve
The present study is funded by the National High Technology R&D Program of China and National Natural Science Foundation of China (Contract No. 50474005).
- 1.Rajagopalan B, Mohanty PS, Mallick PK (2004) Magnesium Technology :131Google Scholar
- 2.Baghni M, Yinshun W, Jiuqing L, Wei Z (2004) Trans Nonferrous Met Soc China 14:1Google Scholar
- 9.Jinko Y, Yim CD, Lim JD (2003) Mater Sci Forum 419–422:851Google Scholar
- 20.Makar GL, Kruger J, Joshi A (1988) In: Paris HG, Hunt WH (eds) Advances in magnesium alloys and composites, TMS, 105Google Scholar
- 21.Boukamp BA (1988) In: Equivalent circuit software. The Netherlands University of Twente, p 6Google Scholar
- 25.Qudong W, Yizheng L, Xiaoqing Z, Wenjiang D (2000) Trans Nonferrous Met Soc China 10:235Google Scholar