脉冲激光焊接Zr基非晶合金晶化后纳米压痕行为  

Nanoindentation deformation behavior of pulse laser welded Zr-based bulk metallic glasses after crystallization

作　　者：郝武民 罗一鸣 于晓全 谢宇航 黄健康[2] Hao Wumin;Luo Yiming;Yu Xiaoquan;Xie Yuhang;Huang Jiankang(China National Nuclear Industry Corporation 404,Lanzhou 735100,China;Lanzhou University of Technology,Lanzhou 730050,China;Taizhou Institute of Zhejiang University,Taizhou 318000,Zhejiang,China)

机构地区：[1]中核四0四有限公司,兰州735100 [2]兰州理工大学,兰州730050 [3]浙江大学台州研究院,浙江台州318000

出　　处：《焊接》2024年第5期21-29,共9页Welding & Joining

基　　金：国家自然科学基金资助项目(51865029)。

摘　　要：试验采用脉冲激光束将Zr基非晶合金与铝结合,研究焊接接头中非晶合金晶化后的纳米压痕变形行为。该文从自由体积与塑性变形能量耗散的角度详细分析了不同晶化相含量对变形行为的影响。焊接接头不同区域的微区X射线衍射研究表明,由于不同的冷却速率可形成3个不同的结晶度区域,焊缝由部分结晶区域(熔合区和热影响区)和非晶态区域(BMGs母材)组成,并且形成了Zr2Cu和Zr2Ni等硬质金属间化合物。该文讨论了压痕周围的锯齿状流动行为和堆积形态,验证了非晶合金中,自由体积越大的区域在纳米压痕过程中呈现出更明显的锯齿,结晶率最高的熔合区具有最高的纳米压痕硬度和约化弹性模量。在1600~3100μN压痕载荷范围内,纳米压痕中的塑性变形能耗随压痕载荷的增大而增大。In the experiment,pulse laser beam was used to join Zr-based bulk metallic glasses with aluminum to study nanoindentation deformation behavior of bulk metallic glasses after crystallization in welded joints.In this paper,influence of different crystallized phase content on deformation behavior was analyzed in detail from the perspective of free volume and plastic deformation energy dissipation.Micro-area X-ray diffraction studies of different zones in weld joints indicated that three different crystallinity regions were formed due to different cooling rate.Weld consisted of partial crystalline zone(fusion zone and heat affected zone)and amorphous zone(BMGs base metal),and hard intermetallic compounds such as Zr2Cu and Zr2Ni were formed.Serrated flow behavior and pile-up morphologies around indentation were discussed in this paper.It was verified that regions with more free volume in bulk metallic glasses exhibited more obvious serrations during nanoindentation.Fusion zone with the highest crystalline fraction showed the highest nanoindentation hardness and reduced contact modulus.In the indentation load range of 1600~3100μN,plastic deformation energy dissipation in nanoindentation increased with indentation load.

关 键 词：非晶合金 焊缝结晶 纳米压痕 自由体积 

分 类 号：TG456.7[金属学及工艺—焊接]