Al_(89)Gd_7Ni_3Fe非晶粉加压成块合金的组织结构与力学性能  

Microstructures and Mechanical Properties of Al_(89)Gd_7Ni_3Fe Alloy Extruded from Its Amorphous Powders

作　　者：祁珊[1] 王仕勤[1] 林萍华[1] 

机构地区：[1]东南大学材料科学与工程系,江苏南京210096

出　　处：《中国稀土学报》2006年第1期70-75,共6页Journal of the Chinese Society of Rare Earths

摘　　要：研究了Al89Gd7Ni3Fe非晶粉末经不同温度热挤压成块后的组织形貌和相结构,分析了非晶的晶化过程,并考察了该合金的弯曲强度和疲劳性能。结果表明,不同温度热挤压成块合金组织均由面心立方的-αAl、二元金属间化合物Al3Gd和少量三元金属间化合物τ1相组成,α-Al晶粒细小,Al3Gd相呈等轴颗粒状,τ1相呈杆状分布,提高热挤压温度,有利于Al3Gd相的析出,不利于τ1相的形成。与普通沉淀硬化型Al合金相比,热挤压成块Al89Gd7Ni3Fe合金具有极高的强度和优良的抗疲劳性能,不同温度热挤压成块Al89Gd7Ni3Fe合金的弯曲强度均超过1000 MPa,提高热挤压温度,合金的强度和疲劳性能也因金属间化合物Al3Gd相含量增加而改善。The microstructures and mechanical properties of Al89Gd7Ni3Fe 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 Al3Gd and ternary intermetallic , phase. The grain size of α-Al is fine. The intermetallic Al3Gd exists as equiaxed particle and τ1, phase appears rodlike. Increasing extrusion temperature enhances Al3Gd precipitation and reduces the formation of τ1 phase. In comparison with conventional precipitation-hardening AI alloy, the extruded Al89Gd7Ni3Fe alloys have extremely high strength over 1000 MPa and excellent fatigue properties. The strength and fatigue property of the alloy improve with the owing to increasing Al3Gd rising extrusion temperature content.

关 键 词：非晶粉末 AL基合金 热挤压 组织结构 疲劳性能 稀土 

分 类 号：TG139[一般工业技术—材料科学与工程]