本文選題：高熵合金 + 激光焊接�。� 參考：《材料科學(xué)與工藝》2017年04期

【摘要】：為開展異種高熵合金激光焊接性研究,采用光纖激光對1.2 mm厚的異種高熵合金CuCoCrFeNi和AlCoCrFeNi實施了對接焊試驗,利用金相觀察、EDS、XRD和顯微硬度計等方法對接頭組織和性能進(jìn)行測試.研究表明:在經(jīng)歷焊接熱循環(huán)后,HAZ的金相組織沒有發(fā)生明顯變化;在FZ附近發(fā)現(xiàn)兩種不同類型的顯微組織(柱狀晶和胞狀晶),WM中心區(qū)由等軸晶組成;WM區(qū)內(nèi)各元素均勻分布,FZ附近區(qū)域焊縫晶界處存在Cu、Al元素的偏聚,與母材相比,該偏聚現(xiàn)象明顯減弱;焊縫橫截面的顯微硬度略高于CuCoCrFeNi合金,遠(yuǎn)低于AlCoCrFeNi合金;異種接頭拉伸試樣斷裂位置發(fā)生在AlCoCrFeNi合金母材處,接頭的抗拉強度σb為166 MPa,斷口形式為解理斷裂,其斷口形貌為扇形花樣與河流狀花樣(無撕裂棱).與母材組織相比,焊縫區(qū)晶粒明顯細(xì)化,且焊縫仍為高熵合金.
[Abstract]:In order to study the laser weldability of dissimilar high-entropy alloy, the butt welding experiments of 1.2mm thick dissimilar high-entropy alloy CuCoCrFeNi and AlCoCrFeNi were carried out by using optical fiber laser. The microstructure and properties of the joints were tested by metallographic observation, EDS-XRD and microhardness meter.The results show that the microstructure of HAZ does not change obviously after welding heat cycling.In the vicinity of FZ, two different types of microstructures (columnar crystal and cellular crystal) are found in the central region of WW M, which are composed of equiaxed crystals and uniform distribution of each element in the Weld grain boundary near FZ. Compared with the base metal, there exists a segregation of Cu-Al elements at the grain boundary of weld in the vicinity of FZ.The segregation phenomenon is obviously weakened, the microhardness of weld cross section is slightly higher than that of CuCoCrFeNi alloy and far lower than that of AlCoCrFeNi alloy, the fracture position of tensile specimen of dissimilar joint occurs at the base metal of AlCoCrFeNi alloy, the tensile strength 蟽 b of the joint is 166MPa, and the fracture is cleavage fracture.The fracture surface is fan-shaped pattern and fluvial pattern (without tearing edge).Compared with the microstructure of base metal, the grain size in the weld zone is finer, and the weld is still a high entropy alloy.
【作者單位】： 沈陽理工大學(xué)材料科學(xué)與工程學(xué)院;中國科學(xué)院沈陽金屬研究所;深圳市大族激光科技股份有限公司;
【基金】：國家重點基礎(chǔ)研究發(fā)展計劃(973計劃)資助項目(2011CB610405)
【分類號】：TG456.7
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本文編號：1748906