Gavras Serge, Buzolin Ricardo H, Subroto Tungky, Stark Andreas, Tolnai Domonkos
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Max-Planck-Strasse 1, D 21502 Geesthacht, Germany.
Institute of Materials Science, Joining and Forming, Graz University of Technology, A8010 Graz, Austria.
Materials (Basel). 2018 Jun 28;11(7):1103. doi: 10.3390/ma11071103.
The mechanical properties of as-cast Mg-4Nd-xZn (x = 0, 3, 5 or 8 wt.%) alloys were investigated both in situ and ex situ in as-cast and solution-treated conditions. The additions of 3 or 5 wt.% Zn in the base Mg-4Nd alloy did not improve yield strength in comparison to the binary Mg-4Nd alloy. Mechanical properties were shown to improve only with the relatively high concentration of 8 wt.% Zn to Mg-4Nd. The change in intermetallic morphology from a continuous intermetallic to a lamella-like intermetallic was the primary reason for the decreased mechanical properties in Mg-4Nd-3Zn and Mg-4Nd-5Zn compared with Mg-4Nd and Mg-4Nd-8Zn. The dissolution of intermetallic at grain boundaries following heat treatment further indicated the importance of grain boundary reinforcement as shown in both in situ and ex situ compression testing. Azimuthal angle-time plots indicated little grain rotation most noticeably in Mg-4Nd, which also indicated the influence of a strong intermetallic network along the grain boundaries.
研究了铸态Mg-4Nd-xZn（x = 0、3、5或8 wt.%）合金在铸态和固溶处理条件下的原位和异位力学性能。与二元Mg-4Nd合金相比，在基础Mg-4Nd合金中添加3或5 wt.%的Zn并没有提高屈服强度。结果表明，只有在Mg-4Nd中添加相对较高浓度的8 wt.% Zn时，力学性能才会提高。与Mg-4Nd和Mg-4Nd-8Zn相比，Mg-4Nd-3Zn和Mg-4Nd-5Zn中金属间化合物形态从连续的金属间化合物变为片状金属间化合物是力学性能下降的主要原因。热处理后晶界处金属间化合物的溶解进一步表明了晶界强化的重要性，这在原位和异位压缩试验中均有体现。方位角-时间图表明，Mg-4Nd中晶粒旋转最少，这也表明了沿晶界的强金属间化合物网络的影响。
