Researchers

Associate Professor Hai CHANG

Keywords：Mg alloys and composites; Superalloy; Deformation of metals; Synchrotron radiation; Creep testing of metals

Contact：hchang@ustb.edu.cn

Researches

Professor Chang’s research areas include development of new Mg alloy and Mg matrix composites, development of new Co, Ni based superalloy, deformation of metals, creep testing of metals and synchrotron radiation. Meanwhile, he developed in-situ deformation devices for the characterization of materials using hard X-ray. He also developed the international cooperation with the STRESS-SPEC (FRM-II reactor Munich, cooperation TU Munich -GKSS-TU Clausthal) for local and in-situ texture analysis.

l  Main Projects

- Project 1：“National Natural Science Foundation of China”, “The lattice misfit of Co based superalloy during the heating process”, total fund 250000 RMB, 2012-2015

- Project 2：A subtask named of "Key technology system of in-situ devices for material deformation " in "Engineering Materials Subproject" of the 12th five-year plan National Major Science and Technology Infrastructure Project—"High energy synchrotron radiation light source verification device" (IHEP-HEPSTF-EM2) led by Institute of high energy physics, Chinese academy of sciences. USTB is the co-construction unit. Subtask leader responsible for the research and development task of RMB 7.82 million, 2014.03-2019.01

-Project 3：“Fundamental research funds for the central universities”, FRF-TP-12-165A, “Measurement of the lattice misfit of Co based superalloy using synchrotron radiation”, total fund 50000 RMB, 2012-2013

-Project 4：“China Postdoctoral Science Foundation”, 11175016, “The interface characterization of the Mg/Al laminated composite fabricated by accumulative roll bonding”, total fund 30000 RMB, 2012-2013

l  Main Contributions

- Synchrotron radiation-based computer tomography, SEM and TEM were employed to characterize the global bonding condition and the interface structure of Mg/Al laminated sheet ARBed after 3 cycles. There existed a definite orientation relationship between Mg17Al12 and Mg, whereas the orientation relationship between Mg17Al12 and Al is not very obvious.

- The necklace-type distribution of the particles in the cast SiCp/AZ91 composite was destroyed and the extrusion bands consisting of SiCp and small dynamic recrystallized grains formed aligning along the extrusion direction. The Mg17A112 discontinuous precipitates preferred to nucleate at the SiC/Mg interfaces and the grain boundaries within the extrusion bands and then expanded into the particle free region. Moreover, the promoted discontinuous precipitates would suppress the continuous intragranular precipitates with respect to the unreinforced AZ91 alloy.

- New in-situ devices adapted for synchrotron radiation have been developed to simulate the deformation process of materials. In-situ compress, tension with the max load of 1.5 T and torsion tests can be conducted with the heating system and gas protection. A ω rotation with loading was developed to meet the requirement of special tests. Translation table of -X, -Y, Z was also included.

l  Publications

1.     Chang Hai, Hu Xiaoshi*, Du Junfeng, Tong Libo，Aging behavior of the extruded SiCp-reinforced AZ91 Mg alloy composite，Journal of Materials Research, 2019, 32 (2), 335-343.

2.     CHANG Hai, XU Chao, HU Xiaoshi*, Microstructure evolution and mechanical properties of Mg/ZK60 laminated composite fabricated by accumulative roll-bonding, Acta Materiae Compositae Sinica, 2019, 36 (01), 178-185.

3.     CHANG Hai, HUANG Yong, HU Xiaoshi*，Microstructure and mechanical properties of short carbon fiber/AZ91 composite fabricated by stir-casting，Acta Materiae Compositae Sinica，2019, 36 (01), 159-166.

4.     Chang Hai, Wang Cuiju, Deng Kunkun, et al., Effects of SiCP content on the microstructure and mechanical properties of SiCP/Mg-5Al-2Ca composites, Rare Metal Materials and Engineering,2018, 47(05), 1377-1384.

5.     Chang Hai*, ZHENG Mingyi, Heinz Guenter Brokmeier, GAN Weimin, Interface Characterization of the Mg/Al laminated composite fabricated by accumulative roll bonding at ambient temperature, Acta Metallurgica Sinica, 2017, 53 (02), 220-226.

6.     Chang Hai*,, WANG Jinlong, ZHENG Mingyi, Wang Xiaojun, Effect of equal channel angular pressing on the microsture evolution and mechanical proterty of the SiCP/AZ91composite fabricated by stir-casting, Materiae Compositae Sinica，2017, 34 (03), 611-618.

7.     Hai Chang*, Mingyi Zheng, Effect of intermetallic compounds on the fracture behavior of Mg/Al laminated composite fabricated by accumulative roll bonding，Rare Metal Materials and Engineering, 2016, V.45 (9), 2242-2245.

8.     Chang Hai*, Wang Xiaojun, Hu Xiaoshi, Wang Yanqiu, Nie Kaibo, Wu Kun，Effects of reinforced particles on dynamic recrystallization of Mg base alloys during hot extrusion，Rare Metal Materials and Engineering, 2014, V.43 (8), 1821-1825.

9.     LIU Mengying, CHANG Hai*, XU Feng, XU Zhengfang, YANG Zhao, WANG Ning, GAN Weimin, FENG Qiang*, Microstructure evolution and mechanical properties of TC1 alloy fabricated by plasma arc cold hearth melting during rolling process, Acta Metallurgica Sinica, 2015, 51(03), 341-348.

10.  Hai Chang*, Mingyi Zheng, Weimin Gan, Chao Xu, Heinz Guenter Brokmeier. Guenter Brokmeier. Texture Evolution of the Mg/Al Laminated Composite by Accumulative Roll Bonding at Ambient Temperature. Rare Metal Materials and Engineering, 2013, V.42 (3) 441-446.

11.  Hai Chang*, Mingyi Zheng, Chao Xu, Guodong Fan, Heinz Guenter Brokmeier, Kun Wu. Microstructure and mechanical properties of the Mg/Al multilayer fabricated by accumulative roll bonding (ARB) at ambient temperature. Materials Science and Engineering A, 2012, V.543, 249-256.

12.  F. Xue, H.J. Zhou, QY Shi, X.H. Chen, H. Chang, M.L. Wang, Q. Feng*. Creep behavior in a γ' strengthened Co–Al–W–Ta–Ti single-crystal alloy at 1000 C. Scripta Materialia, 2015, V.97, 37-40.