CAJ | 학술논문

采用挤压铸造成形工艺制备7055高强铝合金,研究了热挤压参数对合金力学性能及微观组织的影响,并与铸态下的力学性能及微观组织进行了对比.结果表明,热挤压态下的7055铝合金的微观组织和力学性能均优于铸态,并且晶粒随着比压的增加趋于细化,抗拉强度随着比压的增加趋于提高.当比压为75 MPa时,在730 ℃温度下进行挤压浇注,经过双级固溶处理和时效后,合金的晶粒明显细化,抗拉强度达到681.4 MPa,伸长率达到7.14%.
채용제압주조성형공예제비7055고강려합금,연구료열제압삼수대합금역학성능급미관조직적영향,병여주태하적역학성능급미관조직진행료대비.결과표명,열제압태하적7055려합금적미관조직화역학성능균우우주태,병차정립수착비압적증가추우세화,항랍강도수착비압적증가추우제고.당비압위75 MPa시,재730 ℃온도하진행제압요주,경과쌍급고용처리화시효후,합금적정립명현세화,항랍강도체도681.4 MPa,신장솔체도7.14%.
Effects of hot extrusion parameters on mechanical properties and microstructure of the 7055 alloy were investigated by tensile testing and microstructural observation, and they are compared with those of as-cast ones. The results reveal that microstructure and mechanical properties of the hot extruded 7055 aluminum alloy are obviously superior to those of as-cast ones. Meanwhile, with increasing in specific pressure, grain size in the microstructure of the alloy is increasingly refined, and tensile strength is gradually improved. With extrusion casting at 730℃ and 75MPa, the grain size in the alloy after T6 heat treatment is refined obviously with tensile strength of 681.4MPa and elongation of 7.14%.