CAJ | 학술논문

以AlSi合金为过渡材料,运用激光焊接技术实现Be与Be的连接;采用扫描电镜、纳米压痕仪及透射电镜对焊接接头的显微组织、剪切断口形貌及性能进行研究.结果表明:熔合区和焊缝区组织由Be与AlSi合金形成的复合相构成,焊缝区显微硬度和弹性模量分别为2 Gpa和140 Gpa,熔合区宽度约10 μm;焊接接头剪切强度约为283 Mpa,剪切断口具有以准解理为主并伴有塑性的混合型断口特征,熔合区附近热应力诱发的微裂纹、焊缝中的金属间化合物和气孔是导致焊接接头失效的主要原因.
이AlSi합금위과도재료,운용격광한접기술실현Be여Be적련접;채용소묘전경、납미압흔의급투사전경대한접접두적현미조직、전절단구형모급성능진행연구.결과표명:용합구화한봉구조직유Be여AlSi합금형성적복합상구성,한봉구현미경도화탄성모량분별위2 Gpa화140 Gpa,용합구관도약10 μm;한접접두전절강도약위283 Mpa,전절단구구유이준해리위주병반유소성적혼합형단구특정,용합구부근열응력유발적미렬문、한봉중적금속간화합물화기공시도치한접접두실효적주요원인.
Using AlSi alloy as transition material, beryllium with beryllium was welded by laser. The microstructure and performance of the welding joint were studied by means of nanoindentation apparatus, scanning electron microscope (SEM), electron probe microanalysis (EPMA) and transmission electron microscope (TEM). The results indicate that the microstructure of weld and fusion zone for the Be/AlSi/Be laser welding joint is composed of compound phase formed by beryllium and AlSi alloy, and the microhardness and elastic modulus of welding zone are 2 GPa and 140 GPa. The concentration distributions of Al and Si show that the width of fusion zone is about 10 μm. The shear strength of Be/AlSi/Be welding joint is 283 MPa. The characteristic of shear fractographs is quasi-cleavage with local ductile dimples. According to the analysis for shear fractographs, the micro-crack made by welding thermal stress, intermetallic compounds and gas porosities formed in welding zone are the main cause leading to brittle rupture for welding joint.