Quick Search:       Advanced Search
刘明华,王文礼,张梦奇,邱玉龙.热处理对Mg-3.4Y-3.6Sm-2.6Zn-0.8Zr(wt%)合金组织和性能的影响[J].稀有金属材料与工程(英文),2019,48(7):2056~2061.[Liu Minghua,Wang Wenli,Zhang Mengqi and Qiu Yulong.Effect of Heat Treatment on the Microstructure and Mechanical Properties of Mg-3.4Y-3.6Sm-2.6Zn-0.8Zr (wt%) Alloy[J].Rare Metal Materials and Engineering,2019,48(7):2056~2061.]
Effect of Heat Treatment on the Microstructure and Mechanical Properties of Mg-3.4Y-3.6Sm-2.6Zn-0.8Zr (wt%) Alloy
Download Pdf  View/Add Comment  Download reader
Received:December 06, 2018  Revised:December 29, 2018
DOI:
Key words: magnesium alloy  heat treatment  microstructure  mechanical properties
Foundation item:
Author NameAffiliation
Liu Minghua,Wang Wenli,Zhang Mengqi and Qiu Yulong  
Hits: 119
Download times: 0
Abstract:
      The microstructure evolution and mechanical properties of Mg-3.4Y-3.6Sm-2.6Zn-0.8Zr alloy after different heat treatment experiments were investigated by differential thermal analysis (DSC), optical microscopy (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and tensile test, and the optimum heat treatment systems composing of solid-solution treatment at 500°C for 15 hours and aging treatment at 225°C for 40 hours were proposed. After the solution treatment at 500°C for 15 hours, the layer long period stacking ordered (LPSO) structure disappears, whereas (Mg,Zn)3(Y,Sm) at the grain boundary dissolves into a granular state from the reticular phase, and a large number of long strip phases Mg12(Y,Sm)Zn are formed at the same time. After the aging treatment, a large number of dispersed β′ phases precipitate into the α-Mg grains and it is beneficial to improve the yield strength of the experimental alloy. The yield strength (YS), ultimate tensile strength (UTS) and elongation (EL) of the experimental alloy are 170.0 MPa, 260.8 MPa and 14.1%, respectively. The fracture mode changes from intergranular to transgranular fracture after the heat treatment process.