Multi-functional magnesium alloys containing interstitial oxygen atoms.
Multi-functional magnesium alloys containing interstitial oxygen atoms.
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DOI：
10.1038/srep23184
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发表时间：
2016-03-15
影响因子：
4.6
通讯作者：
Bae DH
中科院分区：
文献类型：
--
作者：
Kang H;Choi HJ;Kang SW;Shin SE;Choi GS;Bae DH
通过在镁晶格中溶解大量的氧原子，发展了一类新的镁合金(镁-氧合金)。氧原子是通过在720 °C的镁熔体中分解纳米二氧化钛来提供的；然后，钛在凝固后从镁熔体中完全分离出来。溶解氧原子位于镁的八面体位置，从而扩展了镁的晶格。这些合金具有离子和金属结合特性，提供了出色的机械和功能特性。用这种方法生产的镁氧铝铸造合金具有优异的机械性能、耐化学腐蚀性和导热性能。此外，类似的镁氧锌变形合金在室温下表现出较高的断裂伸长率(>；50%)，这是因为该合金在较大的晶粒(~15 m)周围的亚微米晶(<；300 μnm)中只发生了多次滑移。金属/非金属间隙合金有望开启商业化合金设计的新范式。
A new class of magnesium alloys has been developed by dissolving large amounts of oxygen atoms into a magnesium lattice (Mg-O alloys). The oxygen atoms are supplied by decomposing titanium dioxide nanoparticles in a magnesium melt at 720 °C; the titanium is then completely separated out from the magnesium melt after solidification. The dissolved oxygen atoms are located at the octahedral sites of magnesium, which expand the magnesium lattice. These alloys possess ionic and metallic bonding characteristics, providing outstanding mechanical and functional properties. A Mg-O-Al casting alloy made in this fashion shows superior mechanical performance, chemical resistance to corrosion, and thermal conductivity. Furthermore, a similar Mg-O-Zn wrought alloy shows high elongation to failure (>50%) at room temperature, because the alloy plastically deforms with only multiple slips in the sub-micrometer grains (<300 nm) surrounding the larger grains (~15 μm). The metal/non-metal interstitial alloys are expected to open a new paradigm in commercial alloy design.