Effect of phosphorus on microstructure and growth manner of primary Mg2Si crystal in Mg2Si/Al composite

Modification effect of calcium-magnesia phosphate fertilizer on microstructure and mechanical properties of Mg2Si/Mg-4Si composite

“…Hence, AlP can be excluded. Considering the information from previous studies [12,13,[19][20][21] and EDS detections, it is possible that the core of primary Mg 2 Si is phosphorous compound. In the present study, the size and morphology of primary Mg 2 Si phase in the Mg 2 Si/Mg-4Si composite are controlled by the capability of the substrate for heterogeneous nucleation after being modified by calcium-magnesia phosphate fertilizer.…”

“…most hopeful route to improve the mechanical properties of in-situ composite prepared by simple casting [7] . The modification mechanisms of the Mg 2 Si particles by adding various elements, such as B [8] , Ba [9] , Ca [10,11] , P [12,13] and RE [14][15][16] , have been discussed in previous studies. Generally, there are two major modification mechanisms for primary Mg 2 Si grains.…”

“…One is the poisoning effect: the modification elements gather on the forehead of growth and restrict the crystal growth [17] . The other is heterogeneous nucleation: the modification elements or their compounds act as the heterogeneous nucleus [13,18] . Currently, most scholars considered that the modification mechanism of Ca onto primary Mg 2 Si belong to poisoning effect [10,11] , and P to heterogeneous nucleation.…”

“…Currently, most scholars considered that the modification mechanism of Ca onto primary Mg 2 Si belong to poisoning effect [10,11] , and P to heterogeneous nucleation. Usually, the modifier containing P element was added into Al and Mg alloys via two ways: pure element or master alloy [12,13] . Meanwhile, the constituent nature of the heterogeneous nuclei of primary Mg 2 Si is still in dispute.…”

“…Kim [19] and Schmid, et al [20] reported that the nucleus of primary Mg 2 Si is Mg 3 (PO 4 ) 2 . Nevertheless, Zhao [13] and Liu, et al [21] via EPMA analysis showed that AlP particles act as the cores of primary Mg 2 Si. Furthermore, Hou [22] suggested that Mg 3 P 2 phases serve as the heterogeneous nucleation substrates of primary DOI: 10.1007/s41230-016-6031-9…”