Macro- and Microstructural Studies of Laser-Processed WE43 (Mg-Y-Nd) Magnesium Alloy

作者：Santhanakrishnan S; Kumar N; Dendge N; Choudhuri D; Katakam S; Palanivel S; Vora H D; Banerjee R; Mishra R S; Dahotre Narendra B^*

来源：Metallurgical and Materials Transactions B-Process Metallurgy and Materials Processing Science, 2013, 44(5): 1190-1200.

DOI：10.1007/s11663-013-9896-7

The macro- and microstructural changes in the fusion zone (FZ) of WE43 magnesium alloy processed by a diode-pumped ytterbium (IPG YLS-3000) continuous wave fiber laser for specified processing conditions (from 4.17 to 12.5 x 10(7) J/m(2)) were studied. With the aid of computational heat-transfer model, the temperature history and cooling rate were determined for different laser-processing conditions. The computational heat-transfer results of laser-processed samples were used to correlate with microstructures characterized using optical, scanning, and transmission electron microscopies, and electron backscatter and X-ray diffraction analyses. The microhardness measurement was carried out to establish the structure-property relationship, and the results indicated that the minimal hardness variation (1 pct) within laser FZ was due to a constant heat extraction time (0.1 second), narrow variation in grain size (4 to 7 mu m), and the type of precipitate (beta-phase) formation.

• 出版日期2013-10