CAJ | 학술논문

用热压逐层叠置的Ti/Al箔的方法制备具有全片层结构的γ-TiAl波纹板.热处理工艺为640℃,15h+850℃,35 h+1350℃,2h.用扫描电镜(SEM)和X射线衍射(XRD)分析热处理过程中产生的金属间化合物相.在Al箔完全消耗之前,Ti/Al界面仅有TiAl3相生成.在850℃热压35 h后,基体由α-Ti,a2-Ti3Al,γ-TiAl和TiAl2相组成.冷却得到全片层结构,大部分片层与板面的夹角小于30°.采用较薄的原料箔可以获得相对细小的微观组织.
용열압축층첩치적Ti/Al박적방법제비구유전편층결구적γ-TiAl파문판.열처리공예위640℃,15h+850℃,35 h+1350℃,2h.용소묘전경(SEM)화X사선연사(XRD)분석열처리과정중산생적금속간화합물상.재Al박완전소모지전,Ti/Al계면부유TiAl3상생성.재850℃열압35 h후,기체유α-Ti,a2-Ti3Al,γ-TiAl화TiAl2상조성.냉각득도전편층결구,대부분편층여판면적협각소우30°.채용교박적원료박가이획득상대세소적미관조직.
A 0.7 mm-thick wavy γ-TiAl sheet with fully lamellar microstructure was fabricated by hot pressing Ti/Al alternate foils with heat treatment of 640 ℃,15 h+850 ℃,35 h+1350 ℃,2 h.The intermetallic compounds formed during heat treatments were identified by scanning electron microscopy (SEM) and X-ray diffraction (XRD).TiAl3 was the only observed phase at the Ti/Al interface when Al foils were not consumed.After being annealed at 850 ℃ for 35 h,the microstructure was composed of α-Ti,α2-Ti3Al,γ-TiAl and TiAl2.A fully lamellar microstructure formed after annealing at 1350 ℃.Most of the angles between the lamellar interface and the sheet plane are below 30°.Using thinner starting foils is favorable to produce sheets with fine microstructure.