Microstructure and mechanical properties of AZ91-(SiCP/AZ91) clad plate fabricated by extrusion
Hai CHANG1, Congming ZHAO2, Cuiju WANG2,*()
1 National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 102206, China 2 Shanxi Key Laboratory of Advanced Magnesium-Based Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Multilayered AZ91-(SiCP/AZ91) clad plates were fabricated at 300, 350 ℃ and 400 ℃ successfully by extrusion. The microstructure evolution, bonding interface and the mechanical properties of the AZ91-(SiCP/AZ91) clad plates were investigated in detail. The results show that grain of both of the AZ91 layer and SiCP/AZ91 layer are refined due to the dynamic recrystallization (DRX) during the extrusion processes and the SiCP/AZ91 layer processes much finer grain size. The SiCP distribution of SiCP/AZ91 layer is improved with increasing of extrusion temperature. No obvious delamination is observed in the AZ91-(SiCP/AZ91) clad plates fabricated at different temperatures. The metallurgical bonding of the interface between AZ91 and SiCP/AZ91 basically occurs in the extrusion die. The room-temperature strength of the AZ91-(SiCP/AZ91) composite lies between the AZ91 alloy and the SiCP/AZ91, corresponding well with the rule of mixture (ROM). The inadhesion of the SiCP in the SiCP/AZ91 layer is the main reason for the failure of the AZ91-(SiCP/AZ91) clad plates during tensile test.
WANG H Y , XIA N , BU R Y , et al. Current research and future prospect on low-alloyed high-performance wrought magnesium alloys[J]. Acta Metallugica Sinica, 2021, 57, 1429- 1437.
MA L M , ZHANG J Z , YUE G Q , et al. Application of composites in new generation of large civil aircraft[J]. Acta Materiae Compositae Sinica, 2015, 32 (2): 317- 322.
SHI Q X , WANG C J , DENG K K , et al. Microstructure and mechanical behavior of Mg-5Zn matrix influenced by particle deformation zone[J]. Journal of Materials Science & Technology, 2021, 60, 8- 20.
OHSAKI S , KATO S , TSUJI N , et al. Bulk mechanical alloying of Cu-Ag and Cu/Zr two-phase microstructures by accumulative roll-bonding process[J]. Acta Materialia, 2007, 55 (8): 2885- 2895.
WANG H W , WANG C J , DENG K K , et al. Microstructure and mechanical properties of Al/Mg/Al composite sheets containing trapezoidal shaped intermediate layer[J]. Materials Science and Engineering: A, 2021, 811, 140989.
JAMAATI R , AMIRKHANLOU S , TOROGHINEJAD M R , et al. Comparison of the microstructure and mechanical properties of as-cast A356/SiC MMC processed by ARB and CAR methods[J]. Journal of Materials Engineering and Performance, 2012, 21 (7): 1249- 1253.
WU Y , FENG B , XIN Y , et al. Microstructure and mechanical behavior of a Mg AZ31/Al7050 laminate composite fabricated by extrusion[J]. Materials Science and Engineering: A, 2015, 640, 454- 459.
CHEN L , TANG J W , ZHAO G Q , et al. Fabrication of Al/Mg/Al laminate by a porthole die co-extrusion process[J]. Journal of Materials Processing Technology, 2018, 258, 165- 173.
MAHMOODKHANI Y , WELLS M A . Co-extrusion process to produce Al-Mg eutectic clad magnesium products at elevated temperatures[J]. Journal of Materials Processing Technology, 2016, 232, 175- 183.
ZHA M , ZHANG H M , WANG C , et al. Prominent role of a high volume fraction of Mg17Al12 particles on tensile behaviors of rolled Mg-Al-Zn alloys[J]. Journal of Alloys and Compounds, 2017, 728, 682- 693.
WANG C J , DENG K K , NIE K B , et al. Competition behavior of the strengthening effects in as-extruded AZ91 matrix: influence of pre-existed Mg17Al12 phase[J]. Materials Science and Engineering: A, 2016, 656, 102- 110.
LEE J U , KIM S H , KIM Y J , et al. Effects of homogenization time on aging behavior and mechanical properties of AZ91 alloy[J]. Materials Science and Engineering: A, 2018, 714, 49- 58.
SUN X F , WANG C J , DENG K K , et al. High strength SiCp/AZ91 composite assisted by dynamic precipitated Mg17Al12 phase[J]. Journal of Alloys and Compounds, 2018, 732, 328- 335.
FAN Y D , DENG K K , WANG C J , et al. Work hardening and softening behavior of Mg-Zn-Ca alloy influenced by deformable Ti particles[J]. Materials Science and Engineering: A, 2022, 833, 142336.
HASSAN S F , HO K F , GUPTA M . Increasing elastic modulus, strength and CTE of AZ91 by reinforcing pure magnesium with elemental copper[J]. Materials Letters, 2004, 58 (16): 2143- 2146.
WANG X J , HU X S , NIE K B , et al. Hot extrusion of SiCp/AZ91 Mg matrix composites[J]. Transactions of Nonferrous Metals Society of China, 2012, 22 (8): 1912- 1917.