Mg-3%Al alloy was modified by combining Ca addition with carbon inoculation. The effects of Fe addition and addition sequence on the grain refinement were investigated. A higher grain refining efficiency could be obta...Mg-3%Al alloy was modified by combining Ca addition with carbon inoculation. The effects of Fe addition and addition sequence on the grain refinement were investigated. A higher grain refining efficiency could be obtained for the Mg-Al alloy modified by combining Ca addition with carbon inoculation. Fe addition and addition sequence had no obvious effect on the grain refinement. Ca addition could effectively avoid grain-coarsening resulting from Fe in the carbon-inoculated Mg-Al alloy. The Al-C-O particles, actually being Al4C3, should act as potent substrates for a-Mg grains in the sample treated by combining Ca addition with carbon inoculation. However, the duplex-phase particles of AI4C3 coated on Al-Fe or Al-C-Fe should be the potent substrates for a-Mg grains if Fe existed in the Mg-Al melt. Ca addition can contribute to the formation of the particles of Al4C3 coated on Al-Fe or Al-C-Fe, regardless of the Fe addition sequence. The poisoning effect of Fe was effectively inhibited in the carbon-inoculated of Mg-Al alloy due to Ca addition, namely, Ca has a poisoning-free effect.展开更多
Magnesium（Mg）-3% aluminum（Al）（in weight） alloy was modified by carbon（C） inoculation combining with strontium（Sr）.The effects of trace 0.1% iron（Fe） addition and operating sequence of carboninoculation and...Magnesium（Mg）-3% aluminum（Al）（in weight） alloy was modified by carbon（C） inoculation combining with strontium（Sr）.The effects of trace 0.1% iron（Fe） addition and operating sequence of carboninoculation and Fe addition on the grain size of Mg-3%Al alloy were studied.The results reveal that the Sr addition could effectively suppress grain-coarsening resulted from the inclusion of Fe in the carboninoculated Mg-Al alloy.Sr addition could contribute to the formation of the duplex-phase particles that Al-C-rich phases coated on Al-Fe or Al-C-Fe-rich phases,regardless of the Fe addition sequence.These duplex-phase particles should be the potent substrates for α-Mg grains.Consequently,Sr addition could effectively subsidize the inhibiting effect of Fe on grain refinement and the active nuclei were maintained.In other words,Sr plays a counter role in the poisoning effect of Fe on the microstructure of Mg-3%Al alloy.展开更多
基金Project (50901034) supported by the National Natural Science Foundation of China (NSFC)Project (2010-1174) supported by Scientific Research Foundation (SRF) for the Returned Overseas Chinese Scholars (ROCS), State Education Ministry (SEM)Project (2012ZZ0005)supported by the Fundamental Research Funds for the Central Universities, South China University of Technology, China
文摘Mg-3%Al alloy was modified by combining Ca addition with carbon inoculation. The effects of Fe addition and addition sequence on the grain refinement were investigated. A higher grain refining efficiency could be obtained for the Mg-Al alloy modified by combining Ca addition with carbon inoculation. Fe addition and addition sequence had no obvious effect on the grain refinement. Ca addition could effectively avoid grain-coarsening resulting from Fe in the carbon-inoculated Mg-Al alloy. The Al-C-O particles, actually being Al4C3, should act as potent substrates for a-Mg grains in the sample treated by combining Ca addition with carbon inoculation. However, the duplex-phase particles of AI4C3 coated on Al-Fe or Al-C-Fe should be the potent substrates for a-Mg grains if Fe existed in the Mg-Al melt. Ca addition can contribute to the formation of the particles of Al4C3 coated on Al-Fe or Al-C-Fe, regardless of the Fe addition sequence. The poisoning effect of Fe was effectively inhibited in the carbon-inoculated of Mg-Al alloy due to Ca addition, namely, Ca has a poisoning-free effect.
基金supported by the National Natural Science Foundation of China(No.51574127)the Natural Science Foundation of Guangdong Province(No.2014A030313221)
文摘Magnesium（Mg）-3% aluminum（Al）（in weight） alloy was modified by carbon（C） inoculation combining with strontium（Sr）.The effects of trace 0.1% iron（Fe） addition and operating sequence of carboninoculation and Fe addition on the grain size of Mg-3%Al alloy were studied.The results reveal that the Sr addition could effectively suppress grain-coarsening resulted from the inclusion of Fe in the carboninoculated Mg-Al alloy.Sr addition could contribute to the formation of the duplex-phase particles that Al-C-rich phases coated on Al-Fe or Al-C-Fe-rich phases,regardless of the Fe addition sequence.These duplex-phase particles should be the potent substrates for α-Mg grains.Consequently,Sr addition could effectively subsidize the inhibiting effect of Fe on grain refinement and the active nuclei were maintained.In other words,Sr plays a counter role in the poisoning effect of Fe on the microstructure of Mg-3%Al alloy.
