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Research paper : Energy savings in transportation systems by weight reduction of their components (M. Sakamoto et al.)−129−Synthesiology - English edition Vol.2 No.2 (2009) Term 3Term 4Term 5temperature, hardness and strength can be increased (work hardening), but the formability decreases due to cracks. When plastic forming is done at high temperature, the formability increases dramatically although strength cannot be improved. In general, the former is called cold processing and the latter is called hot processing. By heating the processed material to a certain temperature, the crystals undergo a phenomenon of recrystallization where new crystal grains are formed without distortion. Strictly speaking, processing at low temperature without recrystallization is cold processing, and processing at high temperature with recrystallization is called hot processing.T4 treatment: One of the heat treatment processes to control the mechanical properties of metals. When an alloy element added to a base metal is maintained at high temperature, dispersed evenly, and then cooled rapidly, the alloy metal that usually precipitates at low temperature can be solidified in a state where it remains dissolved in the base metal, and this is called solution. When the solution material is maintained at an appropriate temperature for some time, the dissolved alloy elements precipitate into the base material as fine crystals, and the properties such as strength, hardness, and ductility change. This series of heat treatment is called aging. Aging done at room temperature from the solution state is called natural aging, and aging forced at high temperature is called artificial aging. Among various heat treatment methods, these two are used frequently in the field of light metals. The former is known as T4 treatment while the latter is T6 treatment.Inclusion initiation point: The reduction in strength due to fatigue is caused by microscopic cracks in an object, and these cracks become gradually larger by repeated applied force. The first microscopic crack occurs in a place where stress is concentrated in the object. Stress concentration occurs in various places, but most often occurs around heterogeneous solid impurities (in metal, nonmetallic inclusions such as oxides). When the bond between the interface of such an inclusion and the base metal is weak, the presence of an inclusion becomes a defect of the base metal, and functions similarly to microscopic cracks. The failure is then initiated around the inclusion.TIG welding: Tungsten inert gas welding. One of the welding methods where the metal is melted and joined using arc discharge. This is a method of joining by melting the base metal by producing an arc from a tungsten rod by applying high voltage between the base metal and the tungsten rod with high melting point. Basically, this is done by hand so it can be applied to complex shapes, and it is widely used for welding non-iron metals.M. Sakamoto, S. Akiyama, T.Hagio and K. Ohgi: Magnesium e no calcium tenka niyoru sanka himaku tokusei no henka to nannenka (Change of oxide film property by addition of calcium to magnesium and its combustibility), Chuzo Kogaku (Journal of Japan Foundry Engineering), 69, 227-233 (1997) (in Japanese).Y. Kitahara, K. Ikeda, H. Shimazaki, H. Noguchi, M. Sakamoto and H. Ueno:Nannensei magnesium gokin no hiro kyodo tokusei (AMCa602B no hiro kyodo ni oyobosu hikinzoku kaizai butsu no eikyo (Endurance strength property of noncombustible magnesium alloy (effect of nonmetallic inclusion on endurance strength of AMCa602B)), Fatigue strength characteristics of non-combustible Mg alloy (1 paper: Effect of non-metallic inclusion on fatigue strength of AMCa602B), Kikai Gakkai Ronbunshu (Japan Society of Mechanical Engineers Journal), 57, 7-8 (2004) (in Japanese).Y. Kitahara, K. Ikeda, H. Shimazaki, H. Noguchi, M. Sakamoto and H. Ueno:Nannensei magnesium no hiro kyodo tokusei (dai 1 po, 3 shurui no nannensei magnesium gokin no teiryoteki hiro kyodo tokusei) Endurance strength property of noncombustible magnesium alloy (First report – quantitative endurance strength property of three types of noncombustible magnesium alloys), Fatigue strength characteristics of non-combustible Mg alloy (2nd report: Quantitative comparison among fatigue strength of three non-combustible Mg alloys), Kikai Gakkai Ronbunshu A (Japan Society of Mechanical Engineers Journal A), 72, 661-668 (2006) (in Japanese).K. Ikeda, Y. Kitahara, H. Noguchi, M. Sakamoto and H. Ueno: Nannensei magnesium gokin no hiro kyodo tokusei (yokyoku sanka kotingu zai no tokusei) (Endurance strength property of noncombustible magnesium alloy (property ofanodized coating material)), Fatigue strength characteristics of non-combustible Mg alloy (3rd report: Fatigue characteristics of the anodized non-combustible Mg alloy), Kikai Gakkai Ronbunshu (Japan Society of Mechanical Engineers Journal), 57, 9-10 (2004) (in Japanese).F. Noguchi, S. Yoshida, M. Yamane, K. Kakimoto, T. Tachibana, N. Sakamoto and K. Kawata: Magnesium oyobi magnesium gokin no haisui shori eno oyo (Application of magnesium and magnesium alloy to waste water treatment,Shigen Sozai Gakkai Shunki Taikai Gaiyo (Abstracts of the Spring Conference, The Mining and Materials Processing Institute of Japan), (2006) (in Japanese).F. Noguchi, S. Yoshida, M. Yamane, K. Kakimoto, T. Tachibana, N. Sakamoto and K. Kawata: Haisui chu no yugai kinzoku no jokyo to yuka kinzoku no kaishu – haisui chu no As no jokyo (dai 1 po) (Removal of harmful metals inwaste water and recovery of valuable metals – Removal of As in waste water (first report)), Nihon Tekko Kyokai Dai 149 kai Shunki Koen Taikai Gaiyo (Abstracts of the 149th Spring Conference, The Iron and Steel Institute of Japan), (2005) (in Japanese).F. Noguchi, S. Yoshida, M. Yamane, K. Kakimoto, T. Tachibana, N. Sakamoto and K. Kawata: Haisui chu no yugai kinzoku no jokyo to yuka kinzoku no kaishu – magnesium ni yoru haisui chu no Cr no kaishu (dai 2 ho) (Removal of harmful metals in waste water and recovery of valuable metals – Recovery of Cr in waste water by magnesium (second report)), Nihon Tekko Kyokai Dai 153 kai Shunki Koen Taikai Gaiyo (Abstracts of the 153rd Spring Conference, TheIron and Steel Institute of Japan), (2007) (in Japanese).[1][2][3][4][5][6][7]References

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