摘要:
采用φ振荡和φ固定两种数据采集模式的中子衍射实验结果表明较高的时效温度对消除枝晶最有效,微应变（晶粒区域间的变形不协调性）主要存在于γ＇相.利用中子衍射结合扫描电子显微镜对合金的微观组织形貌进行了细致观察,给出了时效温度和时间对γ＇相的影响状况,超晶格测量发现了γ＇相晶粒之间出现的独特取向差.由不同晶面的中子衍射结果判断时效后合金出现了轻微的四方对称性（a〈c）畸变,对这种畸变起主要作用的是基体相.实验结果同时证实了不同方向的应变差异,因而为筏化驱动模型的定量构建提供了基本实验参量.根据超晶格衍射的计算结果可知,合金相界面是一种复杂的畸变变形,同时得出晶格错配度在-0.1%—-0.3%之间,晶格错配与时效工艺和晶体取向密切相关,过高的一级时效温度或过长的二级时效时间均会降低合金的晶格错配度.
Abstract:
The neutron diffraction results obtained by oscillating and fixing φ during data collection show that the high ageing temperature is effective to eliminate dendrite crystals and the microstrain exists mainly in the γ＇ phase.Based on the microstructure obtained by neutron diffraction and scanning electron microscope,the influence of ageing temperature and time on γ＇ phase are evaluated.The unique misorientations among γ＇ phase grains are observed from superlattice measurements.According to the neutron diffractions of different crystal planes,the crystal symmetry is slightly changed from cubic to quartet （ac） due mainly to the γ matrix phase and the experimental results also prove the strain deviation in difference orientations,thus providing the basis for the existence of driving force for the raft model.The calculation based on the superlattice diffraction shows that in the interfaces between the γ and γ＇ phases exists a complex distortion：the mismatch varies from-0.1% to-0.3% and the mismatch value can be reduced by high temperature during the first ageing and long time during the second ageing.
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