Effects of Nd addition on microstructure and mechanical properties of Mg-6Gd-2.5Y-0.5Zr alloy

Authors：SHI Hong ji; DENG Yun lai; ZHANG Kai; YANG Liu; CHEN Ming an

Source：中国有色金属学报, 2017, 27(9).

DOI：10.19476/j.ysxb.1004.0609.2017.09.04

• neodymium
• magnesium alloy
• microstructure
• mechanical property

The effects of Nd addition on microstructure, age-hardening behavior and mechanical properties of Mg-6Gd-2.5Y-0.5Zr alloy were investigated by optical microscopy (OM), X-ray diffractometry (XRD), transmission electron microscopy (TEM), hardness test and tensile tests. The results show that the amount of second phase (Mg5(Gd/Y) and Mg24(Gd/Y)5) increase significantly in the as-cast alloys, and the age hardening response after quenched is improved apparently with the addition of Nd, the hardness is enhanced and time to peak ageing is shortened. The Mg-6Gd-2.5Y-1Nd-0.5Zr alloy exhibits the maximum yield strength of 241 MPa and ultimate tensile strength of 289 MPa. The reason for the improvement of age-hardening behavior and mechanical properties is the higher number density and finer β′ precipitates in the α-Mg matrix, and morphologies of β′ precipitates also change with Nd addition.

• Institution
  中南大学