Fabrication of extraordinary high-strength magnesium alloy by hot extrusion
Fabrication of extraordinary high-strength magnesium alloy by hot extrusion
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DOI：
10.1016/j.scriptamat.2009.06.003
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发表时间：
2009-09-01
影响因子：
6
通讯作者：
Kamado, S.
中科院分区：
文献类型：
--
作者：
Homma, T.;Kunito, N.;Kamado, S.
采用热挤压+时效的铸锭冶金工艺成功制备了Mg-1.8Gd-1.8Y-0.7Zn-0.2Zr超高强度合金。试样的极限抗拉强度为542 MPa，屈服强度为473 MPa，断裂伸长率为8.0%。这些高强度是由于在动态再结晶晶粒的晶界处的时效和动态沉淀而产生的细沉淀物而实现的。这些沉淀物还显著提高压缩屈服应力，导致屈服各向异性的改善。(C)2009 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Extraordinary high-strength Mg-1.8Gd-1.8Y-0.7Zn-0.2Zr alloy has successfully been fabricated by an ingot metallurgy process with hot extrusion followed by aging. The sample exhibits an ultimate tensile strength of 542 MPa, proof stress of 473 MPa and elongation to failure of 8.0%. These high strengths are achieved as a result of fine precipitates due to the aging and dynamic precipitation at the grain boundaries of dynamically recrystallized grains. These precipitates also substantially enhance the compressive proof stress, resulting in improvement in the yield anisotropy. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.