炊鹏飞

• 1:陕西理工大学材料科学与工程学院

摘要(Abstract)：

采用电弧熔炼炉制备了(ZrTi)_(100-x)Nb_x(x=0, 2, 4, 6, 10 at%)合金,通过光学显微镜(OM),X-射线衍射仪(XRD)和扫描电镜(SEM)等研究了合金的显微结构。结果表明:当Nb含量从0%增加到6%时,铸态合金的物相结构均为α′相;Nb含量为10%时,合金的物相结构由α′相转变为β相。铸态Zr_(50)Ti_(50)合金的组织由针状的α′相及原始β晶界组成,α′的长度及原始β晶粒尺寸最小。当Nb元素含量从2%增加到6%时,合金的原始β晶粒由等轴状变为板条状,且(ZrTi)_(96)Nb_4合金的原始β晶粒尺寸及α′的长度最大;继续增加Nb含量到10%时,合金组织为等轴的β晶粒。铸态Zr_(50)Ti_(50)合金的屈服强度和抗压强度最大,随着Nb含量的增加,合金的强度先降低后增加,在Nb含量为4%时,合金的强度最低。断口形貌表明Nb元素的加入使合金的断裂方式由脆性断裂向韧性断裂转变。

关键词(KeyWords)： Zr-Ti-Nb合金;显微组织;力学性能;断口形貌

Abstract:

Keywords:

基金项目(Foundation): 陕西省自然科学基础研究计划项目(2018JQ5170);; 陕西省教育厅科研计划项目(14JK1155);; 陕西理工大学博士科研启动项目(SLGQD13(2)-14)

作者(Author): 炊鹏飞

DOI: 10.13289/j.issn.1009-6264.2018-0200

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