Details

Autor(en) / Beteiligte

• Bi, Guang li
• Wang, Yashuo
• Jiang, Jing
• Gu, Jiarui
• Li, Yuandong
• Chen, Tijun
• Ma, Ying

Titel

Microstructure and mechanical properties of extruded Mg-Y-Zn (Ni) alloys

Ist Teil von

• Journal of alloys and compounds, 2021-11, Vol.881, p.160577, Article 160577

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

2021

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• •The microstructure and mechanical properties Mg-Y-Zn containing trace of Ni were reported.•The extruded Mg-Y-Zn-Ni (at%) alloy exhibits good comprehensive mechanical properties.•The strengthening mechanism of LPSO phase with three kinds of morphologies was discussed quantificationally. The microstructure and mechanical properties of extruded Mg-2Y–1Zn (MYZ), Mg-2Y-0.5Zn-0.5Ni (MYZN) and Mg-2Y–1Ni (MYN) (at%) alloys were systematically investigated. Apart from α-Mg, Mg2Y, Mg24Y5, along with Y-riched phases, there was precipitation of 18R LPSO phase with coarse-lamellar morphology at the dendritic grain boundary of α-Mg within the above three as-cast alloys. Parts of 18R LPSO phases transformed into 14H LPSO phases in homogenization. After extrusion, the grain size had obviously refined and the LPSO phase with three types of morphologies existed in three extruded alloys, distribution of lamellar 18R LPSO phase might be detected down the extrusion direction (ED), the blocky 18R LPSO phase as well as the fine strip 14H LPSO phase with some stacking faults in the grain interior. The extruded MYZN alloy exhibited the higher basal texture intensity than extruded MYZ and MYN alloys. Furthermore, we discussed the strengthening mechanisms of the LPSO phase with different morphologies. Tensile test results indicated that the as-extruded MYZN alloy exhibited the highest σUTS of 389 MPa, σTYS of 336 MPa and εf of 12.6% at room temperature. As for the extruded MYZN alloy, its improved comprehensive mechanical properties were mainly related to the LPSO phase strengthening, texture strengthening, stacking faults strengthening together with grain refinement.