Microstructural Evolution and Mechanical Behavior of Lead-Free Silicon Brass Manufactured by Low-Pressure Die Casting

作者：Yang, Chao^*; Ye, Wenbing; Yang, Yuchuan; Wang, Fen; Ding, Yanfei; Zhu, Quanli; Zhang, Weiwen

来源：Journal of Materials Engineering and Performance, 2018, 27(10): 5478-5488.

DOI：10.1007/s11665-018-3615-0

• lead-free silicon brass
• low-pressure die casting
• mechanical properties
• microstructures

Low-pressure die casting (LPDC) has been widely used to process aluminum and magnesium alloys; however, it has yet to be applied to manufacture brass alloys. This study investigates the microstructural evolution and mechanical behavior of a lead-free CuZnSiAl silicon brass via a variable-controlling approach on the basis of a faucet casting by LPDC. The manufactured silicon brass castings are predominantly composed of bcc -CuZn(Si, Al) and minor fcc -Cu(Zn, Si) solid solutions. The silicon brass castings also predominantly exhibit short rod-like or granular phases, which distinctly differ from the acicular morphology obtained by conventional gravity casting. The manufactured silicon brass castings which contain finer grains and short rod-like or granular phase exhibit superior mechanical properties. Their optimal mechanical propertieselongation of 15.0%, yield strength of 359.8MPa, and ultimate tensile strength of 598.9MPaare far superior to those of the typical lead brass HPb59-1. The results obtained in this study provide insight into the manufacture and design of lead-free silicon brass castings by LDPC.

• 出版日期2018-10
• 单位华南理工大学