冶金烧结温度对发动机用TiZr基非晶合金组织和力学性能的影响  

Effect of metallurgical sintering temperature on microstructure and mechanical properties of TiZr-based amorphous alloys for engines

作　　者：程彩霞 李炎粉 刘师多[2] CHENG Caixia;LI Yanfen;LIU Shiduo(School of automotive engineering,Yellow River traffic university,jiaozuo 454950,China;College of vehicle engineering»henan university of science and technology,zhengzhou 450000,China)

机构地区：[1]黄河交通学院汽车工程学院,河南焦作454950 [2]河南科技大学车辆工程学院,河南郑州450000

出　　处：《粉末冶金工业》2021年第6期72-76,共5页Powder Metallurgy Industry

基　　金：国家自然科学基金资助项目(51605416)。

摘　　要：为了提高发动机的综合性能,通过放电等离子烧结和粉末冶金结合的方式制备Ti Zr基非晶合金(Ti_(35)Zr_(30)Cu_(24)V_(7.5)Mo_(3.5)),研究不同烧结温度对合金组织和力学性能的影响。研究结果表明:Ti Zr基非晶合金组织中主要存在BCC和FCC两种晶体类型,BCC组织衍射峰强度较FCC组织高,BCC组织晶粒与晶界区域形成了许多弥散态的FCC组织。随着烧结温度升高,合金塑性先增强再减弱,密度提高。提高烧结温度至1100℃时,合金组织生成了更多大尺寸晶粒,抗压强度降低,塑性获得了明显提升。在1100℃下进行烧结时,断口部位存在明显韧窝结构,合金表现出了良好的塑性和韧性。随着烧结温度的升高,合金试样整体上由沿晶断裂转变为脆性断裂特征。In order to improve the comprehensive performance of engine,TiZr-based amorphous alloy(Ti_(35)Zr_(30)Cu_(24)V_(7.5)Mo_(3.5))was prepared by spark plasma sintering and powder metallurgy.The effects of sintering temperature on the microstructure and mechanical properties of Ti Zr-based amorphous alloy were studied.The results show that there are two forms of crystal(BCC and FCC)in the microstructure of TiZr-based amorphous alloy,and the diffraction peak intensity of BCC is higher than that of FCC.Meanwhile,many dispersed FCC structures are found in the BCC grain and grain boundary region.With the increase of sintering temperature,the plasticity of the alloy is first strengthened and then weakened,and the density increases.When the sintering temperature rises to 1100℃,the compressive strength reduces and the plasticity improves obviously as more large grains are generated.Under 1100℃,the alloy exhibits good ductility and toughness due to obvious dimples at the fracture site.With the rising of sintering temperature,the samples transform from intergranular fracture to brittle fracture.

关 键 词：高熔点合金 放电等离子烧结 组织结构 力学性能 

分 类 号：TK406[动力工程及工程热物理—动力机械及工程] TF125[冶金工程—粉末冶金]