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| EFFECT OF LaCl3 ADDITION IN FLUX ON THE MICROSTRUCTURE AND PROPERTIES OF MAGNESIUM ALLOYS |
| WU Guohua; GAO Hongtao; ZHU Yanping; DING Wenjiang |
| State Key Laboratory of Metal Matrix Composite; Shanghai Jiaotong University; Shanghai 200030 |
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Cite this article:
WU Guohua; GAO Hongtao; ZHU Yanping; DING Wenjiang. EFFECT OF LaCl3 ADDITION IN FLUX ON THE MICROSTRUCTURE AND PROPERTIES OF MAGNESIUM ALLOYS. Acta Metall Sin, 2004, 40(7): 694-698 .
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Abstract The effects of the fluxes containing LaCl$_{3}$ on the mechanical properties, structure,
fractography and corrosion behavior of magnesium alloy have been measured. The
results show that small and nodular Al$_{10}$La$_{2}$Mn$_{7}$ phases can
be formed in melts after fluxes containing LaCl$_{3}$ was added
to Mg melt which can act as nucleating site of $\gamma$
phases, making the $\gamma$ phases
refined. The tensile strength $\sigma_{\rm b}$
and elongation $\delta$ can be improved
by addition of LaCl$_{3}$.
Using fluxes containing 5\% LaCl$_{3}$, the $\sigma_{\rm
b}$ and $\delta$ of the alloy can be improved from
161 MPa and 2.1\% to 203 MPa and 4.0\%, respectively.
That is, the $\sigma_{\rm b}$ and $\delta$ increased by 26\% and
100\%, respectively. Increasing the content of LaCl$_{3}$
further, the fluxes will agglomerate during
the refinement process, so that the inclusions
in the melt will increase and the mechanical
properties of Mg alloys decrease. The fracture mechanism of quasincleavage of
Mg alloy has not been changed by LaCl$_{3}$,
The corrosion test results show that LaCl$_{3}$ can improve
obviously the corrosion resistance of Mg alloy.
The corrosion rate of magnesium alloys can
decrease from 1.10 mg/(cm$^{2}\cdot$d) to
0.17 mg/(cm$^{2}\cdot$d) in 5\%NaCl solution by using
fluxes containing 5\% LaCl$_{3}$. That is, the
corrosion rate can be decreased by 84\%.
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Received: 10 October 2003
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