Cu-Zr-Al非晶合金制备及压缩与冲击断裂机理  

Preparation of Al-Cu-Zr Bulk Metallic Glasses and Its Compression and Impact Fracture Mechanism

作　　者：赵金国[1] 阎治安[2] Zhao Jinguo1, Yan Zhian2(1.Department of Mechanical and Electrical Technology, 2.School of Electrical Engineering, Xi＇an Jiaotong Xijing University Universit)

机构地区：[1]西京学院机电技术系 [2]西安交通大学电气工程学院

出　　处：《特种铸造及有色合金》2018年第9期1041-1044,共4页Special Casting & Nonferrous Alloys

基　　金：陕西省教育厅专项科研计划资助项目(15JK2186);国家科技重大专项资助项目(2017ZX04011010)

摘　　要：采用真空电弧熔炼及铜模铸造法制备了Cu-Zr-Al块状金属玻璃(BMGs),研究了Cu54.5-xZr45.5Alx(x=3,5,7)BMGs的非晶形成能力和压缩及冲击断裂机理。结果表明,增加Cu54.5-xZr45.5Alx中Al含量使得BMGs的热稳定性先提高后降低,其中Al含量为5%时非晶形成能力最好。Al含量增大有利于提高材料压缩及冲击断裂应力,其中Al含量为7%的BMGs的断裂应力最大,试样中产生的微合金化对其强度影响不大。Cu54.5-xZr45.5Alx合金压缩和冲击断裂过程均包括弹性变形和断裂两个阶段。试样受冲击过程中出现局部熔融现象,断口处形成拉拔的金属纤维状及液滴状形貌,而试样在压缩过程中只发生局部软化。因冲击应变速率较大,试样内积蓄的弹性变形能也较大,使得冲击试样断裂应力普遍高于压缩试样的。Al-Cu-Zr bulk metallic glasses（BMGs）were prepared by vacuum arc melting and copper mold casting.The glass-forming ability（GFA）and compression as well as impact strength of Cu54.5-xZr45.5 Alx（x =3,5,7）BMGs were analyzed.The results reveal that,with the increase of Al content in Cu54.5-xZr45.5 Alx,the thermal stability of BMGs is increased firstly and then decreased,and the amorphous formation ability with 5% Al content exhibits desirable.The increase of Al content in Cu54.5-xZr45.5 Alxis beneficial to enhancing material compression and impact fracture stress,and alloy with 7%Al has the maximum fracture stress.The effects of microalloying on strength of the alloy with7%Al can be ignored.Both the compression and impact fracture process of the alloy include two stages of elastic deformation and fracture.The local melting phenomenon occurs at the fracture surface during the impact process,finally the metal fiber and molten droplet morphology can be formed,while the materials only soften at the fracture during the compression process.Due to the larger impact strain rate,the elastic deformation energy accumulated in the specimen is the larger,which makes the fracture stress of the impact specimen generally higher than that of the compressed ones.

关 键 词：非晶合金 压缩强度 冲击强度 微合金化 局部熔融 

分 类 号：TG146.11[一般工业技术—材料科学与工程] TG139.8[金属学及工艺—金属材料]