喷射沉积Al—5.5Cu／TiB2自生复合材料的显微组织及性能

研究了采用喷射沉积工艺制得的Ａｌ５．５Ｃｕ／ＴｉＢ２（２０％）自生复合材料的沉积态及挤压态显微组织：沉积态组织细小，颗粒分布均匀，颗粒与基体界面结合良好，很少出现孔洞，原铸态自生组织中呈针片状的ＴｉＡｌ３相消失而呈颗粒状分布，析出相细小弥散；挤压态组织中孔洞基本弥合，纵向组织具有一定方向性，颗粒分布有些不均匀（有一定的条带）。力学性能测试结果表明：喷射沉积后的Ａｌ５．５Ｃｕ／ＴｉＢ２自生复合材料的抗拉强度比铸态提高约５０ＭＰａ，延伸率则提高５００％左右，耐磨性能也有较大提高

MICROSTRUCTURES AND PROPERTIES OF Al 5.5Cu/TiB 2 IN SITU COMPOSITES PREPARED BY SPRAY DEPOSITION

The microstructures (both as deposition and as extruded) of Al 5.5Cu/TiB 2(20%) in situ composites prepared by spray deposition were studied. The grains(as deposition) are fine and well distributed, the needle and flake shaped TiAl 3 phase in as cast changes to particle shape, the precipitation is fine and dispersive; the porosity of the materials (as extruded) almost dispears, but it is found that there are some strip structures of TiB 2 in the longitudinal direction. It is proved that the tensile strength of the materials prepared by spray deposition is elevated to 420 MPa, and the elongation of the materials is elevated about 4 times, meanwhile the wear resistance of the material is elevated.