Mg-based metallic glass matrix composite with in situ porous titanium dispersoids by dealloying in metallic melt
Mg-based metallic glass matrix composite with in situ porous titanium dispersoids by dealloying in metallic melt
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DOI：
10.1016/j.msea.2013.06.015
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发表时间：
2013-10
期刊：
影响因子：
6.4
通讯作者：
H. Oka;Wei Guo;T. Wada;H. Kato
中科院分区：
文献类型：
--
作者：
H. Oka;Wei Guo;T. Wada;H. Kato
采用金属熔体脱合金法制备了具有多孔α-Ti弥散相的Mg3 Cu 3Gd大块非晶复合材料。原位生成的α-Ti弥散体的孔径约为500 nm，这是由预合金中的Ti 2Cu沉淀物形成的。因此，通过预合金制备的冷却速率可以控制孔隙尺寸。塑性没有明显提高，但四点弯曲模式下的最大断裂应力从整体对应的217 MPa增加到387 MPa。这是由于分散体尺寸（L）×分散体间隔距离（S）×处理区尺寸（Rp）的最佳关系。这是在多孔Ti弥散体内部和周围局部实现的，并且有助于改善韧性和延展性。
A Mg3Cu3Gd bulk metallic glass matrix composite with porousα-Ti dispersoids was prepared by dealloying in a metallic melt. The in situ formedα-Ti dispersoids had a pore-size of ∼500 nm, which was imparted from the Ti2Cu precipitate in the prealloy. Pore size was therefore controllable through the cooling rate of the prealloy preparation. Plasticity was not improved apparently, however the maximum fracture stress under four point bending mode increased from 217 MPa for the monolithic counterpart to 387 MPa. This was due to the optimal relationship where dispersoid size (L)≈dispersoid interval distance (S)≈process zone size (Rp). This was achieved locally within and around the porous Ti dispersoids, and helped improve the toughness and ductility.