鎂合金是以鎂為基加入其他元素組成的合金。其特點是：密度小（1.8g/cm3鎂合金左右），比強度高，彈性模量大，消震性好，承受沖擊載荷能力比鋁合金大，耐有機物和堿的腐蝕性能好。主要合金元素有鋁、鋅、錳、鈰、釷以及少量鋯或鎘等。目前使用最廣的是鎂鋁合金，其次是鎂錳合金和鎂鋅鋯合金。主要用於航空、航天、運輸、化工、火箭等工業部門。在實用金屬中是最輕的金屬,鎂的比重大約是鋁的2/3，是鐵的1/4。它是實用金屬中的最輕的金屬,高強度、高剛性。
中國鎂合金：Mg9998 Mg9995 Mg9990 Mg9980 ZM1 ZM2 ZM3 ZM4 ZM5 ZM6 ZM7 ZM10
YM5 ZMgZn5Zr ZMgZn4RE1Zr ZMgRE3ZnZr ZMgRE3Zn2Zr ZMgA18Zn ZMgRE2ZnZr ZMgZn8AgZr ZMgAl10Zn YZMgAl9Zn AZ31B AZ31S AZ31T AZ40M AZ41M AZ61A AZ61M AZ61S AZ62M AZ63B AZ80A AZ80M AZ80S AZ91D M1C M2M M2S ZK61M ZK61S ME20M Mg99.95 Mg99.50 Mg99.00
歐洲：EN-MB99.5 EN-MB99.80-A EN-MB99.80-B EN-MB99.95A EN-MB99.95B EN-MB10010 EN-MB10020 EN-MB10021 EN-MB10030 EN-MB10031 MgAlZn MgAlMn MgAlSi MgZnCu MgZnREZr MgREAgZr MgYREZr EN-MBMgAl2Si EN-MBMgAl4Si EN-MBMgZn6Cu3Mn EN-MBMgZn4RE1Zr EN-MBMgRE3Zn2Zr EN-MBMgRE2Ag2Zr EN-MBMgRE2Ag1Zr EN-MBMgY5RE4Zr EN-MBMgY4RE3Zr EN-MCMgAl18Zn1
EN-MCMgAl9Zn1(A) EN-MCMgAl9Zn1(B) EN-MCMgAl2Mn EN-MCMgAl5Mn
EN-MCMgAl6Mn EN-MCMgAl2Si EN-MCMgRE3Zn2Zr EN-MCMgRE2Ag2Zr
EN-MCMgRE2Ag1Zr EN-MCMgY5RE4Zr EN-MCMgY4RE3Zr EN-MB21110
EN-MB21120 EN-MB21121 EN-MB21210 EN-MB21230 EN-MB21310 EN-MB21320 EN-MB32110 EN-MB35110 EN-MB65120 EN-MB65210 EN-MB65220 EN-MB95310 EN-MB95320 EN-MC21110 EN-MC21120 EN-MC21121EN-MC21210 EN-MC21220 EN-MC21230 EN-MC21310 EN-MC21320 EN-MC32110 EN-MC35110 EN-MC65120 EN-MC65210 EN-MC65220 EN-MC95310 EN-MC95320 EN-MB21110
美國：M11311 M11312 M11610 M11800 M15100 M16600 AZ31B AZ31C AC61A AZ80A M1A ZK40 ZK60A AM100A AZ81A AZ91C AZ92A EZ33A HK31A QE22A 9980A 9980B 9990A 9995A 9998A M10600 M10410 M11910 AM60A AS41A AZ91A AZ91B AZ31B AZ31C HK31A HK21A ZE10A LA141A AZ61A AZ80A M1A ZK40 ZK60A ZM100A AZ63A AZ81A AZ91C AZ92A EZ33A HK31A HZ32A K1A QE22A QH21A QH21A ZE41A ZE63A ZH62A ZK51A ZK61A AZ91A AZ91B AM60A AS41A
英國：MAG-S-101 MAG-E-101 MAG-F-101 MAG-S-111 MAG-E-111 MAG-E-121 MAG-F-121 MAG-S-131 MAG-E-131 MAG-F-131 MAG-S-141 MAG-E-141 MAG-F-141 MAG-S-151 MAG-E-151 MAG-F-151 MAG-E-161 MAG-F-161 Mg-Mn1.5 Mg-Al3Zn1Mn Mg-Al6Zn1Mn Mg-Zn2Mn1 Mg-Zn1Zr Mg-Zn3Zr Mg-Zn6Zr MAG1 MAG3 MAG4 MAG7 MAG2 MAG5 MAG6 MAG8 MAG9 Mg-Al8ZnMn Mg-Al10ZnMn Mg-Zn4.5Zr Mg-Al8.5Zn1Mn Mg-Al8ZnMn Mg-Zn4REZr Mg-RE3ZnZr Mg-Th3Zn2Zr Mg-Zn5.5Th2Zr MAG-S-101 MAG-S-111 MAG-S-131 MAG-S-141 MAG-S-151 MAG-F-101 MAG-F-121 MAG-F-131 MAG-F-141 MAG-F-151 MAG-F-161 Mg-Mn1.5 Mg-Al6Zn1Mn Mg-Zn2Mn1 Mg-Zn1Zr Mg-Zn3Zr Mg-Zn6Zr R503 MAG-E-101 MAG-E-111 MAG-E-121 MAG-E-131 MAG-E-141 MAG-E-151 MAG-E-161
法國：G-A3Z1 G-A6Z1 G-A8Z G-M2 G-Z5Zr G-A4S1 G-A6 G-A6Z1 G-A8Z1 G-A9Z1
德國：H-Mg99.95 H-Mg99.8 3.5002 3.5003 MgMn2 MgAl3Zn MgAl6Zn MgAl8Zn 3.5200 3.5312 3.5612 3.5812 G-MgAl8Zn1 G-MgAl8Zn1ho GK-MgAl8Zn1 G-MgAl9Zn1 G-MgAl9Zn1ho G-MgAl9Zn1Wa GK-MgAl9Zn1 GK-MgAl9Zn1ho GK-MgAl9Zn1wa GD-MgAl9Zn1 G-MgAl6 G-MgAl6ho GD-MgAl6 GD-MgAl6Zn1 GD-MgAl4Si1 G-MgZn4SE1Zr1 G-MgZn5Th2Zr1 G-MgSE3Zn2Zr1 G-MgTh3Zn2Zr1 G-MgAg3SE2Zr1 3.5812.01 3.5812.43 3.5812.02 3.5812.92 3.5812.05 3.5912.01 3.5912.43 3.5912.61 3.5912.02 3.5912.92 3.5912.62 3.5912.05 3.5662.01 3.5662.43 3.5662.05 3.5612.05 3.5470.05 3.5101.91 3.5102.91 3.5103.91 3.5105.91 3.5106.61
日本：1級 2級 M1 M2 M3 M4 M5 M6 MCIn1 MCIn2 MCIn3 MCIn5 MDCIn1A MDCIn1B 1種MB1 2種MB2 3種MB3 4種MB4 5種MB5 6種MB6 MC1 MC2 MC3 MC5 MC6 MC7 MC8
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