Abstract This work investigates the hydrogen states and their corresponding effects on the mechanical properties of several kinds of magnesium alloys. Magnesium alloys can have tens to near hundreds microgram/gram of hydrogen, depending on the alloying element species and additions. Pure Mg has a hydrogen content of 12.7 μg/g. Al and Zn have a limited influence on hydrogen content, and the addition of rare earth elements Y, Gd and Nd significantly increases the hydrogen content to as high as 95 μg/g. Excess hydrogen causes highly alloyed magnesium alloys to suffer from gas porosity problems and deterioration of mechanical properties. The mechanical properties of as-cast AZ91-0.4Ca alloy can be promoted after the removal of hydrogen. The ultimate strength can be improved from 95 MPa to 150 MPa. The rare earth containing magnesium alloys are less likely to suffer gas porosity because excess hydrogen is incorporated into the cuboid-shaped rare earth hydrides. Additional hydride particles can form around the grain boundaries of the Mg-RE alloys during the homogenization. The formed hydrides should be mainly due to the strong hydrogen bonding by the rare earth atoms.

中文翻译：

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镁合金中氢态及其对力学性能影响的研究

摘要 这项工作研究了氢态及其对几种镁合金力学性能的相应影响。镁合金可以含有数十到接近数百微克/克的氢，这取决于合金元素的种类和添加量。纯镁的氢含量为 12.7 μg/g。Al 和 Zn 对氢含量的影响有限，稀土元素 Y、Gd 和 Nd 的加入显着提高了氢含量，高达 95 μg/g。过量的氢会导致高合金镁合金出现气孔问题和机械性能劣化。铸态AZ91-0.4Ca合金除氢后力学性能得到提高。极限强度可从95 MPa提高到150 MPa。含稀土的镁合金不太可能出现气孔，因为过量的氢被结合到长方体形状的稀土氢化物中。在均质化过程中，会在 Mg-RE 合金的晶界周围形成额外的氢化物颗粒。形成的氢化物应该主要是由于稀土原子的强氢键。