Strong and ductile age-hardening Mg-Al-Ca-Mn alloy that can be extruded as fast as aluminum alloys
Strong and ductile age-hardening Mg-Al-Ca-Mn alloy that can be extruded as fast as aluminum alloys
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DOI：
10.1016/j.actamat.2017.03.046
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发表时间：
2017-05-15
期刊：
影响因子：
9.4
通讯作者：
Kamado, S.
中科院分区：
文献类型：
--
作者：
Nakata, T.;Xu, C.;Kamado, S.
研制了Mg-1.3Al-0.3Ca-0.4Mn（wt.%）变形镁合金。或AXM 10304，其可以以与铝合金的挤压速度相当的24 m/min的非常高的出模速度挤压，并且在时效硬化后表现出优异的强度和伸长率的组合，即，拉伸0.2%屈服应力为287 MPa，伸长率为20%。高的拉伸强度是由于单层Guinier普雷斯顿（G. P.）分散在平均晶粒尺寸为17 μ m的晶粒中的区域和镁合金挤压件典型的纤维织构。G. P.区的均匀分散促进了交叉滑移，并且G. P.区不作为裂纹起始和扩展部位，因此防止了时效硬化后伸长率的降低。挤压和时效硬化的AXM 10304的强度和延伸率的组合优于Mg-6Al-1 Zn（AZ 61）和Mg-6.0Zn-0.5Zr（ZK 60）商业合金的强度和延伸率的组合，并且与不含任何昂贵成分的6000系列铝合金的强度和延伸率的组合相当。因此，这种合金可能会开辟一个新的应用领域，其中重量减轻是一个优先问题。(C)2017 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
We have developed a wrought magnesium alloy, Mg-1.3Al-0.3Ca-0.4Mn (wt.%) or AXM10304, that can be extruded at a very high die-exist speed of 24 m/min, comparable to the extrusion speed for aluminum alloys, and that exhibits an excellent combination of strength and elongation after an age-hardening, i.e., a tensile 0.2% proof stress of 287 MPa and an elongation of 20%. The high tensile proof stress is attributed to the dispersion of a high number density of monolayer Guinier Preston (G.P.) zones dispersed in grains with an average grain size of 17 mu m and fiber texture typical of Mg alloy extrusions. The uniform dispersion of the G.P. zones facilitates cross-slip, and the G.P. zones do not work as crack initiation and propagation site, so the degradation of the elongation after the age-hardening is prevented. The combination of strength and elongation of the extruded and age-hardened AXM10304 is superior to those of Mg-6Al-1Zn (AZ61) and Mg-6.0Zn-0.5Zr (ZK60) commercial alloys and comparable to those of 6000 series of aluminum alloys without any expensive ingredients. Therefore, this alloy may open up a new application areas where weight reduction is of a priority issue. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.