Effect of adding micro amount rare earthelementLaNd on mechanical property of Bi5Sb8Sn solder alloy

A new Bi5Sb8SnRE quaternary alloy was formed by adding different content of rare earthLa, Nd into Bi5Sb8Sn solder alloy to study the effect of its mechanical property and microstructure. The results shows that: The tensile strength and shear strengthreaches a maximum are 58.30 MPa and 15.50 MPa, compared with Bi5Sb8Sn matrix, in which increased by 44.17% and 57.0% respectivelywhen RE adds up to 0.2%. The Microscopic analysis shows that adding micro amount of RE could refine the microstructure. Meanwhile, more uniform microstructure, improvements of the mechanical properties were obtained with RE additon. However, the RE compounts are increased and the mechanical properties were decreased when the addition of RE more than 0.2wt.%.