Precipitation Hardening Response of Ti Addition on BS40 Brass by Powder Metallurgy

摘要

The precipitation hardening behavior of BS40-1.0Ti (Cu40Zn1.0Ti) was investigated with respect to mechanical properties and microstructures. Water atomized BS40 (Cu40Zn) and BS40-1 .OTi (Cu40Zn1.0Ti) alloy powders were used as raw powders. BS40-Ti premixed powder was prepared by mixing BS40 powder with 1.0 wt.% Ti powder elementally. Both BS40-Ti prealloyed and BS40-1.0Ti premixed powders were consolidated at 1073K for 0.6 ks by spark plasma sintering (SPS) and hot extruded subsequently. It was observed that the precipitation response of Ti between BS40 showed significant grain refinement effect on extruded BS40-1.0Ti alloys compared with BS40. Thus, excellent strengthening effect by precipitation hardening was obtained, which responding to yield strength of 345 MPa and 290 MPa, and ultimate tensile strength of 597 MPa and 520 MPa for extruded BS40-1 .OTi prealloyed and premixed alloys, which showed 65.9% and 39.5%, 30.4% and 13.6% higher values than that of the conventional extruded BS40 binary brass, respectively.