Hot deformation behavior and microstructure evolution of GH3536-TiB_(2) composites fabricated by powder metallurgy  

作　　者：ZHOU ShiPeng WANG Shuai HUANG LuJun ZHANG Rui CHEN Xin MENG FanChao CHEN Run SUN FengBo WANG CunYu GENG Lin 

机构地区：[1]School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China [2]Waikato Centre for Advanced Materials and Manufacturing,School of Engineering,University of Waikato,Hamilton 3240,New Zealand [3]State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China

出　　处：《Science China(Technological Sciences)》2024年第7期2107-2124,共18页中国科学（技术科学英文版）

基　　金：supported by the National Key R&D Program of China (Grant No. 2021YFB3701203);the National Natural Science Foundation of China (Grant Nos. U22A20113, 52171137, 52201156 and 52071116);Heilongjiang Touyan Team Program, Heilongjiang Provincial Natural Science Foundation of China (Grant No. TD2020E001);Heilongjiang Postdoctoral Fund (Grant No. LBH-Z20058);Key Laboratories Foundation (Grant No. 6142910220206)。

摘　　要：The hot deformation behavior and microstructure evolution of GH3536-TiB2composites fabricated by powder metallurgy(PM)were examined in the temperature range of 950–1150℃ and strain rate range of 0.001–1 s^(-1). The hot compression stress-strain curves and the constitutive equation were obtained. In addition, the hot processing map was drawn, which indicated that the appropriate hot working window was 950–1050℃/0.001–0.1 s^(-1)and 1050–1100℃/0.001–0.01 s^(-1). The microstructure analysis showed that the splitting and spheroidization of M3B2led to a decrease in size and volume fraction at 950–1100℃. At 1150℃,the eutectic microstructure of M_(3)B_(2)+ γ was formed due to the dissolution of M_(3)B_(2), which caused macroscopic cracking of the deformed sample. Additionally, the deformation temperature and the strain rate had little effect on the size and volume fraction of M_(3)B_(2). Besides, discontinuous dynamic recrystallization(DDRX) and continuous dynamic recrystallization(CDRX) were found in the deformed microstructure, while the former was dominant. Within the test range of this work, the dynamic recrystallization(DRX) fraction of the deformed composites was high due to the bulging nucleation of numerous interfaces. The DRX grain size increased with increasing deformation temperature or decreasing strain rate. Texture analysis showed that the deformation texture of <101>//compression direction RD existed in the matrix when the deformation temperature was below 1100℃, and the texture type became <001>//RD at 1100℃. Additionally, it was also found that the <001>//RD texture was formed in M3B2under the strain rates of 0.1 and 0.01 s^(-1).

关 键 词：GH3536 alloy matrix composites powder metallurgy hot deformation behavior microstructure evolution 

分 类 号：TF125[冶金工程—粉末冶金] TB33[冶金工程—冶金物理化学]