中文摘要：

通过对一种含Re镍基合金进行1100℃长期时效处理及组织形貌观察，研究了时效处理对含Re镍基合金组织结构的影响。结果表明：元素W、Re可促进TCP相的析出，合金在1100℃长期时效期间，TCP相沿{111}晶面〈110〉方向以共格方式析出，在不同晶面多组针状TCP相可相互垂直、或互成60°角排列，并确定出析出的TCP相为μ相。在μ相析出的初始阶段，由于两相共格界面应变能的作用，使μ相沿γ’相的{111}晶面呈薄片状析出。随高温时效的时间延长，片状μ相增厚，两相界面失去共格，使晶格应变能降低；随后按界面能最小原理，μ相局部区域出现沟槽，可提高元素Re、W的化学位，其μ相不同区域的化学位之差促使元素扩散及μ相逐渐熔断，并直至发生球化，其中，两凸起μ相之间的界面张力σμ/μ是使μ相沟槽不断溶解加深及发生球化的驱动力。

英文摘要：

By means of the aged treated for longer time at 1100 ℃ and microstructure observation, an investigation has been made into the influence of the aged time on the microstructure of a nickle-based superalloy. Results show that the elements W and Re may promote the precipitation of TCP phase. After aged for long time at 1100 ℃, the TCP phase is precipitated in the form of the coherent lattice along the { 111 } planes and 〈110〉 orientation, which is determined as μ phase by means of the electric diffraction analysis. In the initial stages of μ phase precipitated, the μ phase is precipitated in the form of the sheep-like structure due to the role of the coherent lattice strain energy. The observed strip-like μ phase may be arranged in the upright each other or 60° each other on the different crystal planes, and the width plane in the strip-like μ phase is parallel to the { 111 } planes of y phase. The thickness of the strip-like g phase may be increased as the aged time is prolonged, which decreases the lattice strain energy of μ/γ phases interfaces due to the loss of the coherent interfaces. Whereafter, the groove appears in the local regions of the strip-like μ phase according to the principle of the interfaces energy minimum, which enhances the chemical potential energy of the elements W and Re. In the future, the difference of the chemical potential energy in the different regions of the strip-like μ phase promotes the diffusion of the elements W, Re and the dissolving abruption of the location region of μ phase, and up to the spheroidized of μ phase occurs. Thereinto, the interfaces tension σμ/μ between the protuberant μ phase is thought to be the driving force of the groove dissolved and spheroidized of μ phase.