Effect of Lanthanum Addition on Grain Refinement and Mechanical Properties of Mg-9Li-3Al Alloy

被引：7
作者：
Dinesh, P. [1 ]
KumareshBabu, S. P. [1 ]
Natarajan, S. [1 ]
机构：
[1] Natl Inst Technol, Dept Met & Mat Engn, Tiruchirappalli 620015, Tamil Nadu, India
来源：
METALS AND MATERIALS INTERNATIONAL | 2021年 / 27卷 / 10期
关键词：
Magnesium; Lithium; Casting; Lanthanum; Intermetallics; Microstructure; MICROSTRUCTURE; SOLUTE; CERIUM;
D O I：
10.1007/s12540-020-00776-9
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The impact of lanthanum addition on the microstructural changes and mechanical characteristics of Mg-9Li-3Al + xLa alloys are studied. The alloys are fabricated through a liquid metallurgy route involving stir casting by an electrical resistance furnace. The microstructural analysis showed that the as-cast alloys primarily comprises of alpha-Mg and beta-Li phases. Irregular distribution of Al-Li lamellar and some granular fragments MgLi2Al observed over the magnesium-rich alpha-phase and lithium-rich beta-phase. The influence of lanthanum addition to the alloy system leads to grain refinement by forming Al(11)La(3)and Al4La intermetallics. Among the series of cast alloys, the Mg-9Li-3Al-1La alloy exhibits excellent ultimate tensile strength-178 MPa with 10.2% elongation. Addition of 1.5 wt% La and beyond tends to coarsen the grains leading to a reduction in mechanical strength. Hot extruded Mg-9Li-3Al-1La alloy exhibited more refinement in the microstructure and breakdown of intermetallic (Al4La and Al11La3) is observed. A significant improvement in the UTS values around 39% displayed by the Mg-9Li-3Al-1La alloy extruded at a ratio of 25:1. Graphic
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页码：3993 / 4001
页数：9
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