本文關(guān)鍵詞：平頭壓痕法研究釬焊接頭的蠕變性能　出處：《華東理工大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 平頭壓痕 蠕變 微觀組織 Sn-3.5Ag-0.7Cu

【摘要】：釬焊技術(shù)作為材料連接技術(shù)的一類重要方法,在航空航天、石油化工、汽車電子等各個(gè)領(lǐng)域中得到了日益廣泛的應(yīng)用。目前,研究工作者針對塊體釬料的組織、蠕變性能等進(jìn)行了大量的研究,但是由于釬焊接頭尺寸小,難以采用傳統(tǒng)的拉伸實(shí)驗(yàn)方法對其蠕變性能進(jìn)行研究,因此針對釬焊接頭的蠕變性能研究甚少。而壓痕技術(shù)對研究材料的大小和形狀沒有特殊要求,具有在釬焊接頭蠕變性能評價(jià)方面的應(yīng)用潛力。本課題以Sn-3.5Ag-0.7Cu/Cu釬焊接頭為研究對象,自主搭建了壓痕蠕變試驗(yàn)平臺。首先通過光學(xué)顯微鏡(OM)、能譜儀(EDS)、掃描電子顯微鏡(SEM)研究了壓痕蠕變后釬焊接頭的元素含量變化和微觀組織。其次建立了一個(gè)簡單的位錯(cuò)模型定性分析了壓痕位置處材料的凸起和位錯(cuò)行為,從位錯(cuò)滑移的角度解釋了壓入位置對壓蠕變性能的影響。最后,系統(tǒng)的研究了不同蠕變溫度、蠕變應(yīng)力作用下釬焊接頭的壓蠕變性能,蠕變溫度、蠕變應(yīng)力變化范圍為100-130℃、70～100 MPa,并詳細(xì)探討了壓入位置對釬焊接頭的壓蠕變性能的影響。結(jié)果表明隨著壓入位置距基體距離的增大,釬焊接頭的抗蠕變性能逐漸降低。當(dāng)壓入位置到達(dá)焊縫區(qū)正中間時(shí),釬焊接頭的抗蠕變性能達(dá)到最低,當(dāng)壓入位置緊挨基體區(qū)域時(shí),釬焊接頭的抗蠕變性能最強(qiáng)。
[Abstract]:As an important method of material joining technology, brazing technology has been widely used in aerospace, petrochemical, automotive electronics and other fields. At present, researchers aim at the microstructure of bulk solder. Many researches have been done on creep properties, but it is difficult to use the traditional tensile test method to study the creep properties of brazed joints because of their small size. Therefore, there is little research on the creep properties of brazed joints, while the indentation technology has no special requirements for the size and shape of the materials. It has the potential to be applied in the evaluation of creep properties of brazed joints. This paper takes Sn-3.5Ag-0.7Cu/Cu brazed joints as the research object. The creeping test platform of indentation was set up by ourselves. Firstly, the optical microscope was used to fabricate the OMU, and the EDS was measured by energy spectrometer (EDS). Scanning electron microscope (SEM). The changes of element content and microstructure of brazed joints after indentation creep were studied. Secondly, a simple dislocation model was established to qualitatively analyze the protruding and dislocation behavior of the materials at indentation locations. The effect of pressure-in position on the compressive creep property is explained from the angle of dislocation slip. Finally, the compressive creep property and creep temperature of brazed joint under different creep temperature and creep stress are systematically studied. The creep stress ranges from 100 to 130 鈩，

本文編號：1431887