高强度Ti-Cu-Ni系合金的力学性能.pdfVIP

学兔兔 Dec．2008 铸 造 VoI．57 NO．12 FOUNDRY ·1245· -__ I_-_ Ej 问 强度Ti—Cu—Ni系合金的力学性能 索忠源‘，邱克强 ，李庆丰 ，任英磊 ，胡壮麒 (1．沈阳工业大学材料科学与工程学院，辽宁沈阳l10023； 2．中国科学院沈阳金属研究所沈阳材料国家 (联合)实验室，辽宁沈阳110016) 摘要：采用铜模铸造法制备了直径为2I／llTI的Ti u， (x=8-4o)系列合金，通过扫描电镜、x．射线 (XRD)、以及 压缩试验对合金的组织、相组成、力学性能及断口形貌进行了研究。结果发现：该合金系均由晶态相组成，没有发现 非晶相的存在；压缩试验表明：随着Ni含量的增加，合金的断裂强度和塑性变形量随之增加，屈服强度呈现出先增加 后降低的趋势；当Ni含量为40at．％时，断裂强度达到了2 200MPa，塑性变形量达到2％，且具有明显的两次屈服现象。 关键词：钛合金；力学性能；高强度 中图分类号：TG138．9 文献标识码：A 文章编号：1001—4977(2008)12—1245—03 Mechanical Properties of High Strength Ti-·Cu—·Ni Alloys SUO Zhong-yuan’。QIU Ke-qiang’，LI Qing—feng’，REN Ying—lei’，HU Zhuang—qi (1．School of Materials Science and Engineering，Shenyang University of Technology，Shenyang 1 1 0023，Liaoning，China；2．Shenyang National Laboratory for Materials Science，Institute of Metal Research，Chinese Academy of Sciences，Shenyang 1 1 0016，Liaoning，China) Abstract：The Ti．Cu．Ni alloys with 2 mm diameters have been fabricated by copper mold casting． Microstructures of the as．．cast specimens were investigated by using of scanning electron microscopy(SEM)．The phase nature was determined using X—ray diffraction(XRD)analysis．The mechanical properties were measured by uniaxial compressive test at room temperature．The fractured surfaces of samples were investigated bv SEM．The result shows that the as．cast alloys are made of crystalline phases，and do not contain amorphous phase．The compressive test shows that the fracture strength and the plasticity in