Effects of Cr and Al Contents on the Preparation of SiC Fiber-Reinforced NiCrAl Alloy Matrix Composite

doi:10.1007/s40195-020-01024-0

Abstract

Abstract:

In this work, the effects of Cr and Al contents on the preparation of SiC fiber-reinforced NiCrAl alloy matrix composites (SiC_f/Ni-20Cr-5Al, SiC_f/Ni-15Cr-5Al, SiC_f/Ni-10Cr-5Al and SiC_f/Ni-10Cr-3Al) were thoroughly discussed. The composites were prepared by vacuum hot pressing process using matrix-coated fibers. It was found that Cr solute atoms played a significant role in retarding the recrystallization of NiCrAl alloy matrix, and the Al elements in the form of γ′-Ni₃Al phase had a suppression effect on the plastic flow of the matrix. Therefore, the reduction in Cr and Al contents was conductive to the recrystallization and plastic flow of NiCrAl alloy matrix, thereby reduced the size and number of micro-voids in the composite. In addition, this work provides some guidance for designing and manufacturing reasonable SiC fiber-reinforced Ni alloy matrix composites.

Key words: SiC fiber, NiCrAl alloy, Composite, Recrystallization, Plastic flow

Haoqiang Zhang, Xixi Niu, Zhiliang Pei, Nanlin Shi, Jun Gong, Chao Sun. Effects of Cr and Al Contents on the Preparation of SiC Fiber-Reinforced NiCrAl Alloy Matrix Composite[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(10): 1416-1422.

Figures/Tables 8

Fig. 1 Schematic diagram of the process of preparing the composite

Table 1 Chemical compositions of the NiCrAl coatings on the surface of the matrix-coated fibers (wt.%)

Element	Ni-20Cr-5Al	Ni-15Cr-5Al	Ni-10Cr-5Al	Ni-10Cr-3Al
Ni	74.40	79.84	84.42	86.53
Cr	20.87	14.78	10.47	10.79
Al	4.73	5.38	5.11	2.68

Fig. 2 Morphologies of a SiCf/Ni-20Cr-5Al, b SiCf/Ni-15Cr-5Al, c SiCf/Ni-10Cr-5Al, d SiCf/Ni-10Cr-3Al composites prepared on the condition of 940 ℃/60 MPa/2 h

Fig. 3 XRD patterns of the four kinds of SiCf/NiCrAl composites

Table 2 Phase compositions and proportions of NiCrAl alloys with different Cr and Al contents (at.%)

Phase	Ni-20Cr-5Al	Ni-15Cr-5Al	Ni-10Cr-5Al	Ni-10Cr-3Al
γ′-Ni₃Al	10.02	10.08	10.14	6.22
γ	89.98	89.92	89.86	93.78

Fig. 4 Morphologies of a SiCf/Ni-20Cr-5Al, b SiCf/Ni-10Cr-3Al composites prepared on the condition of 990 ℃/60 MPa/2 h

Fig. 5 Transverse-section morphologies of a SiCf/Ni-20Cr-5Al, b SiCf/Ni-15Cr-5Al, c SiCf/Ni-10Cr-5Al, d SiCf/Ni-10Cr-3Al composites prepared on the condition of 960 ℃/60 MPa/2 h

Fig. 6 Transverse-section morphologies of a Ni-20Cr-5Al, b Ni-15Cr-5Al, c Ni-10Cr-5Al, d Ni-10Cr-3Al matrices in different composites prepared on the condition of 960 ℃/60 MPa/2 h

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