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利用应变诱发熔化激活法(SIMA)制备了7075铝合金半固态坯料。研究了半固态加热温度与保温时间对7075铝合金半固态坯料显微组织及压缩性能的影响。结果表明:半固态等温温度越高,球形率越好,液相率越高,初生α-Al固相颗粒的尺寸呈先降后升的趋势,而坯料的抗压强度则呈与之相反的趋势,等温温度595~610℃时达到理想状态;随着保温时间的延长,初生α-Al固相颗粒的球形率越好,颗粒尺寸逐渐增大,液相率无明显变化,而坯料的抗压强度呈先升高后略微下降的趋势,保温时间15~30 min时达到理想状态;在595℃保温30 min时,获得的7075铝合金半固态坯料的初生固相颗粒均匀、细小、圆整,抗压强度可达426.82 MPa。
7075 aluminum alloy semi-solid billet was prepared by strain-induced melting activation (SIMA). The effects of semi-solid heating temperature and holding time on microstructure and compressive properties of 7075 aluminum alloy semi-solid billet were studied. The results show that the higher the semisolid isothermal temperature is, the better the spherical rate is. The higher the liquid fraction, the size of the primary α-Al solid particles first descends and then increases, whereas the compressive strength of the billet is in the opposite direction Trend, the isothermal temperature of 595 ~ 610 ℃ reached the ideal state; with the holding time extended, the better the spherical α-Al solid phase particle size, particle size gradually increased, no significant change in the liquid phase, The compressive strength first increased and then decreased slightly. The holding time reached the ideal state at 15-30 minutes. When the temperature was 595 ℃ for 30 minutes, the primary solid particles of 7075 aluminum alloy semi-solid billet were uniform, fine and round , Compressive strength up to 426.82 MPa.