半固态ZCuSn10铜合金二次加热组织的演化

发布时间：2018-10-14 20:31

【摘要】：采用热轧与重熔的SIMA法制备了ZCu Sn10铜合金半固态坯料。先通过多向热轧对ZCu Sn10铜合金坯料进行预变形,然后对其进行半固态温度区间保温不同时间的二次加热处理。使用光学显微镜、扫描电镜、能谱及图像分析软件等手段研究了坯料二次加热过程中微观组织的演化,并分析了α(Cu)球化组织的形成机制。结果表明:在热轧变形量为16%、加热温度为930℃时,随着保温时间的延长半固态ZCu Sn10铜合金坯料初生α(Cu)逐渐发生球化,平均晶粒直径先减小后增大,由二次加热保温8 min的68.24μm先减小至10 min的62.31μm然后增大至25 min的71.09μm;保温10 min时平均晶粒直径最小,液相率由保温8 min时的18.14%逐渐增加到保温25 min时的25.32%;形状因子随着保温时间的延长先减小后增加,由保温8 min时的2.91先减小至15 min时的1.67,然后增大到保温25 min时的2.43。保温15 min时的半固态组织最优,其平均晶粒直径为65.64μm、液相率为23.66%、形状因子为1.67。在半固态铜合金二次加热过程中,组织演变的主要机制是加热前期的晶粒合并长大和液相增加后的原子扩散导致的晶粒长大并球化。
[Abstract]:Semi-solid billets of ZCu Sn10 copper alloy were prepared by hot rolling and remelting SIMA method. The ZCu Sn10 copper alloy billet was pre-deformed by multi-direction hot rolling, and then treated with secondary heating at different time in the semi-solid temperature range. The microstructure evolution of billet during secondary heating was studied by means of optical microscope, scanning electron microscope, energy spectrum and image analysis software, and the formation mechanism of 伪 (Cu) spheroidized microstructure was analyzed. The results show that when the hot rolling deformation is 16 and the heating temperature is 930 鈩，

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