超声热压烧结7075铝合金微观组织及力学性能的研究OA
Study on microstructure and mechanical properties of 7075 aluminum alloys by ultrasonic hot-pressing sintering
针对传统热压烧结7075铝合金晶粒较粗、有气孔、相对密度低和力学性能差等问题,采用超声热压烧结技术制备7075铝合金,研究烧结温度(450、475、500、525 ℃)对铝合金微观形貌和力学性能的影响.结果表明,随着烧结温度的增加,铝合金的相对密度、屈服强度、抗拉强度、伸长率均先增加后降低.当烧结温度为500℃时,铝合金具有大而深的韧窝,且晶粒尺寸小,力学性能最佳,相对密度为(99.99±0.01)％,屈服强度为(153±5)MPa,抗拉强度为(245±10)MPa,伸长率为(6.78±0.29)％,比无超声热压烧结分别提高了 1.09％、15.90％、10.86％和 60.28％.
To solve the problems of coarse grains,pores,low relative density,and poor mechanical properties of traditional hot-pressed sintered 7075 aluminum alloys,the 7075 aluminum alloys were prepared by ultrasonic hot-pressing sintering technology,and the influence of sintering temperature(450,475,500,525 ℃)on the microstructure and mechanical properties of aluminum alloys was studied.The results show that with the increase of sintering temperature,the relative density,yield strength,tensile strength,and elongation of the aluminum alloys all increase first and then decrease.When the sintering temperature is 500 ℃,the aluminum alloys have the large and deep dimples,small grain size,and the best mechanical properties,the relative density is(99.99±0.01)％,the yield strength is(153±5)MPa,the tensile strength is(245±10)MPa,and the elongation is(6.78±0.29)％,which is increased by 1.09％,15.90％,10.86％,and 60.28％,respectively,compared with the non-ultrasonic hot-pressing sintering.
宁梦莎;高姣姣;王卓;宋金鹏
太原理工大学航空航天学院,太原 030024太原理工大学航空航天学院,太原 030024太原理工大学机械工程学院,太原 030024太原理工大学机械工程学院,太原 030024
矿业与冶金
超声热压烧结7075铝合金烧结温度微观组织力学性能
ultrasonic hot-pressing sintering7075 aluminum alloyssintering temperaturemicrostructuremechanical properties
《粉末冶金技术》 2026 (2)
202-209,8
国家自然科学基金资助项目(52205492)山西省基础研究计划资助项目(202303021221037)山西省科技成果转化引导专项(202204021301039)
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