纳米压痕法测量锌铝钎料的室温蠕变应力指数  

Measurement of creep stress exponent of Zn-Al filler metal at room temperature by using nanoindentation

作　　者：姬峰[1] 薛松柏[1] 刘霜[1] 娄继源 娄银斌 

机构地区：[1]南京航空航天大学材料科学与技术学院.南京210016 [2]浙江新锐焊接材料有限公司,嵊州312452

出　　处：《焊接学报》2013年第2期75-78,117,共4页Transactions of The China Welding Institution

基　　金：南京航空航天大学大学生创新训练计划资助项目(2012-10287047)

摘　　要：利用纳米压痕技术,采用恒加载速率法,研究了Zn-22Al和Zn-22Al-0.03Ti钎料的室温蠕变行为,并对相关数据进行了测量和计算.结果表明,室温时任一载荷条件下保载时,钎料均发生了明显的蠕变行为.其中Zn-22Al-0.03Ti钎料的压入深度和蠕变位移均小于Zn-22Al钎料,最大差值分别为15.68%和26.87%.相同保载时间不同载荷保载时,两种钎料的蠕变位移均有较大差异.通过拟合计算分别获得了两种钎料室温时的蠕变应力指数,Zn-22Al-0.03Ti较Zn-22Al提高了35.79%.分析认为,Ti元素的添加导致了Zn-22Al钎料晶粒的细化,从而产生了更多的晶界是导致钎料室温抗蠕变能力提高的主要原因.The creep behavior of Zn-22Al and Zn-22Al-0.03Ti filler metals at room temperature were studied by nanoindentation in this paper,and constant loading rate method was used to calculate the creep stress exponent.The results indicate that,both the Zn-22Al and Zn-22Al-0.03Ti produced obvious creep deformation under holding load.Both the depth and creep displacement of Zn-22Al-0.03Ti were less than that of Zn-22Al,and the maximum difference were 15.68% and 26.87%,respectively.Under the constant time,the filler metals produced different creep displacement with different loadings.The creep stress exponents of two filler metals at room temperature were obtained by fitting method.Zn-22Al-0.03Ti had a higher creep stress exponent than Zn-22Al filler metal,which implied that Ti-bearing filler metals had better creep resistance than Zn-22Al alloy.The grain of Zn-22Al filler metal could be refined remarkably with the Ti addition,which might result in the increase of grain boundary and finally enhanced the creep resistance of alloy.

关 键 词：纳米压痕 锌铝钎料 蠕变变形 应力指数 

分 类 号：TG425.2[金属学及工艺—焊接]