Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 684, Issue -, Pages 158-164Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.11.009
Keywords
WE43 alloy; Direct-chill casting; Microstructures; Mechanical properties; Age-hardening
Categories
Funding
- National Key Research and Development Program of China [2016YFB0301102]
- National Natural Science Foundation of China [51271063, 51571068]
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High quality WE43 magnesium alloy ingots with diameter of 500 mm are successfully fabricated by direct-chill (DC) casting. The alloying elements distributed almost homogeneously across the large ingot. With the average grain size decreasing from the center to the edge of the ingot, the mechanical properties are improved gradually. After solution treatment at 525 degrees C for 8 h, the Mg14Nd2Y phases distributing along the grain boundaries are well dissolved into matrix. The direct-chill (DC) casting ingot exhibits remarkable age-hardening response from 85 Hv to 117 Hv after T6 treatment at 250 degrees C. The T6 peak-aged sample exhibits ultimate tensile strength of 274 MPa, yield strength of 215 MPa and elongation to failure of 3.4%, which are higher than those of sand-cast and permanent mold cast WE43 alloys. The large amount of nano prismatic beta' and beta 1 phases precipitated during T6 treatment contribute to improved strength of the WE43 alloy.
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