论文部分内容阅读
The microstructures and mechanical properties of Al_ 89Gd_7Ni_3Fe alloy extruded from its amorphous powder were investigated at different temperatures. Devitrification process of amorphous phase was also analyzed. As a result, the microstructure of the extruded alloy consists of fcc α-Al, binary intermetallic Al_3Gd and ternary intermetallic τ_1 phase. The grain size of α-Al is fine. The intermetallic Al_3Gd exists as equiaxed particle and τ_1 phase appears rod-like. Increasing extrusion temperature enhances Al_3Gd precipitation and reduces the formation of τ_1 phase. In comparison with conventional precipitation-hardening Al alloy, the extruded Al_ 89Gd_7Ni_3Fe alloys have extremely high strength over 1000 MPa and excellent fatigue properties. The strength and fatigue property of the alloy improve with the rising extrusion temperature owing to increasing Al_3Gd content.
The microstructures and mechanical properties of Al_89Gd_7Ni_3Fe alloy extruded from its amorphous powder were investigated at different temperatures. Devitrification process of amorphous phase was also analyzed. As a result, the microstructure of the extruded alloy consists of fcc α-Al, binary intermetallic Al_3Gd and In ternary intermetallic τ_1 phase. The grain size of α-Al is fine. The intermetallic Al_3Gd exists as equiaxed particle and τ_1 phase appears rod-like. Increasing extrusion temperature enhances Al_3Gd precipitation and reduces the formation of τ_1 phase. hardening Al alloy, the extruded Al_89Gd_7Ni_3Fe alloys have extremely high strength over 1000 MPa and excellent fatigue properties. The strength and fatigue property of the alloy improve with the rising extrusion temperature due to increasing Al_3Gd content.