为了研究微量Sc、Zr在Al-Mg-Mn合金中的作用,采用铸锭冶金方法制备了Al-6.0 Mg-0.5 Mn-(Sc、zr)合金,通过光学显微镜、显微硬度、透射电镜组织观察和低频扭摆法测量内耗方法研究了微量Sc、Zr对Al-6.0 Mg-0.5 Mn的组织、再结晶行为及内耗性能的影响.研究表明:添加质量分数为0.21%Sc和0.15%Zr可显著细化Al-6.0 Mg-0.5 Mn合金铸态组织;粒状Al_3Sc_(1-x)Zr_x 相对位错、晶界有强烈钉扎作用,抑制合金再结晶;冷变形后的Al-6.0Mg-0.5Mn-0.21Sc-0.15Zr合金的内耗表现出非线性特征,频率越低或温度越高,合金内耗Q~(-1) 越大.在频率为1 Hz、应变振幅为4.6×10~(-5) 下,冷变形Al-6.0Mg-0.5Mn-0.21Sc-0.15Zr合金升温Q~(-1) -T曲线上在326℃时产生内耗峰,该峰可由Al_3Sc_(1-x)Zr_x 沉淀粒子与位错脱钉机制解释.微量Sc、Zr可以细化Al-Mg-Mn合金组织,抑制合金的再结晶,导致合金在升温Q~(-1) -T曲线上产生内耗峰.
To study the effects of trace Sc, Zr on Al -Mg- Mn alloy, Al-6. 0 Mg- 0. 5 Mn- (Sc、Zr) alloy were prepared by ingot metallurgy, and its microstructures, recrystallization processing and internal-friction properties were studied by means of optical microscope (OM) , micro-hardness testing, transmission electronic microscope (TEM) and low-frequency torsion method. Results show that, 0. 21wt. % Sc and 0. 15wt. % Zr can fine the casting microstructure of Al -6.0Mg -0. 5Mn alloy. The strong pin dislocation and grain boundary of Al_3Sc_(1-x)Zr_x particles prohibitthe alloy' s recrystallization. After 54% cold deformation, the Al- 6. 0Mg-0. 5Mn- 0. 21Sc -0. 15Zr alloy shows non-linear internal friction character. The internal friction increases with the increased temperature and decreased tested frequency. An internal friction peak occurs at 326 ℃ in heating Q~(-1) - Tcurve tested at the frequency of 1 Hz and the strain amplitude of 4. 6 × 10~(-5) , which is in-duced by dislocation interacting with fine precipitation particle Al_3Sc_(1-x)Zr_x , and can be explained by the mechanism of dislocation pull-ff from the pinned Al_3Sc_(1-x)Zr_x particles. It can be concluded that the trace So, Zr can fine the microstructure and prohibit the recrystallization of Al - Mg - Mn alloy, and cause the appear-ance of internal friction in the alloy' s heating Q~(-1) - T curve.
参考文献
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