Natural ageing in magnesium alloys and alloying with Ti
Natural ageing in magnesium alloys and alloying with Ti
复制标题
DOI：
10.1007/s10853-007-2250-1
复制
发表时间：
2008-02
影响因子：
4.5
通讯作者：
J. Buha
中科院分区：
文献类型：
--
作者：
J. Buha
本文报道了一个显着的自然时效响应观察到的第一次在这项工作中的Mg-Zn基合金。在这些合金中，自然时效条件下的硬度通常几乎等于人工时效条件下的硬度。在自然时效条件下达到最大硬度的时间可以从二元Mg-Zn合金所需的几个月显著减少到当添加一些充当促进剂的额外合金化元素时几周的实际持续时间。在此提出的这些元素的实例是Cu和Ti。这些合金在自然时效条件下的强化是通过形成非常高密度的Guinier-Preston（GP）区域型沉淀物来实现的。Cu和Ti还通过增加强化沉淀物的数量密度来增强人工时效响应。与Cu不同，Ti对耐腐蚀性无害，并且目前的结果表明，它对Mg-Zn基合金也具有非常显著的晶粒细化效果。
This article reports on a remarkable natural ageing response observed for the first time in this work in Mg–Zn-based alloys. In these alloys, hardness in the naturally aged condition, generally, almost equals that in the artificially aged condition. The time to maximal hardness in the naturally aged condition can be dramatically reduced from several months needed for a binary Mg–Zn alloy, to a practical duration of a few weeks when some additional alloying elements that act as accelerants are added. Examples of such elements presented here are Cu and Ti. Strengthening in the naturally aged condition of these alloys is achieved through the formation of a very high density of Guinier-Preston (GP) zone-type precipitates. Both Cu and Ti also enhance the artificial ageing response by increasing the number density of the strengthening precipitates. Unlike Cu, Ti is not detrimental to the corrosion resistance and the current results indicate that it also has a very pronounced grain-refining effect on the Mg–Zn-based alloys.