Effect of minor elements on the creep resistance of Mg-Zn-Mn-(Ca) alloy |
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Authors: | D M Kang J O An J S Kwak |
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Institution: | (1) Jiangsu Key Laboratory for Advanced Metallic Materials, Southeast University, Nanjing, 211189, People’s Republic of China;(2) Ford Motor Research & Engineering (Nanjing) Co. Ltd., Nanjing, 211100, People’s Republic of China;(3) Nanjing Welbow Metals Co. Ltd., Honglan, Nanjing, 211221, People’s Republic of China |
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Abstract: | Along with alumium, titanium and composite alloys, magnesium alloys have been given much attention by industry for applications
such as lightweight automobiles and electronics because of their high strength, low specific density and good damping characteristics.
In this paper, creep tests were done with magnesium alloys (Mg-3% Zn-1% Mn, Mg-1.2% Zn-1% Mn, and Mg-3% Zn-1% Mn-0.3% Ca)
containing different amounts of Zn to investigate the effect of Zn and Ca on the deformation behavior and the rupture time
for Mg alloy creep under elevated temperatures. The alloys were obtained as follows: (1) pure magnesium (9.7 kg) was melted
at 720°C in an SF6 atmosphere; (2) the temperature was increased up to 800–820°C after adding 0.3 kg of pure Mn to make the
Mg-1% Mn master alloy; (3) the minor element (Zn, Ca) was added to the master alloy; and (4) the magnesium alloy melts were
cast into a metallic mold preheated to 150°C. The creep tests were executed under a constant load and temperature to measure
the steady-state rate and rupture time of creep. Based on the experimental results, the creep behavior of the alloys seemed
to be controlled by dislocation climb at around 0.5∼0.55Tm (Tm; melting temperature). In addition, the results showed that the addition of Ca was effective for increasing the creep resistance
of a Mg alloy: the more Zn present in the alloy, the stronger the creep strength of the alloy. |
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