Effect of B4C on the Microstructure and Mechanical Properties of As-Cast TiB+TiC/TC4 Composites

doi:10.1007/s40195-014-0035-5

Abstract

Abstract:

Different additions of B₄C were introduced into TC4 to alter the microstructure and mechanical properties. The morphologies of reinforcements are related to the solidification paths. The refinement of lamellar spacing λ is based on the precipitation pattern of β-phases. Microhardness, compression elastic modulus (E_c), and elastic modulus of the matrix (E_m) appear non-linear relationships with B₄C additions. Due to the refinement of lamellar spacing with Hall–Petch-type relationships, and the solution strengthening of C on the α + β matrix, the effect of reinforcements on the mechanical properties will be more efficient when the additions of B₄C are no more than 0.19 wt%. When the additions of B₄C are more than 0.19 wt%, the efficiency will decrease.

Key words: Titanium matrix composites, Lamellar spacing λ, Microstructure, TiC, TiB, Nanoindentation

Jiheng Wang, Xianglong Guo, Lv Xiao, Liqiang Wang, Weijie Lu, Baohui Li, Zhongquan Li, Di Zhang. Effect of B₄C on the Microstructure and Mechanical Properties of As-Cast TiB+TiC/TC4 Composites[J]. Acta Metallurgica Sinica (English Letters), 2014, 27(2): 205-210.

Figures/Tables 7

Table 1 Compositions of TiB+TiC/TC4 composites

Sample	TiB+TiC (TiB:TiC ≈ 4:1) (vol%)	Al–47.5V alloy (wt%)	Al (wt%)	B₄C (wt%)	Ti
TC4	0	8.43	1.57	0	Bal.
TMC1	0.5	8.39	1.56	0.10	Bal.
TMC2	1	8.34	1.55	0.19	Bal.
TMC3	5	8.00	1.49	0.97	Bal.
TMC4	10	7.56	1.41	1.93	Bal.
TMC5	20	7.00	1.25	3.86	Bal.
TMC6	30	5.84	1.09	5.76	Bal.

Fig. 1 SEM morphologies of TiB+TiC/TC4 composites with different additions of B4C: a Ti–6Al–4V; b TMC1; c TMC2; d TMC3; e TMC4; f TMC5; g TMC6

Fig. 2 Solidification paths of TiB+TiC/TC4 composites (where the subscripts p, m, and e denote the primary phase, binary eutectic, and ternary eutectic point, respectively): a TMC1, TMC2, TMC3; b TMC4; c TMC5; d TMC6

Fig. 3 Variation of lath thickness of TiB+TiC/TC4 composites with different additions of B4C

Fig. 4 Variation of microhardness of TiB+TiC/TC4 composites with different volume fractions of TiB+TiC

Fig. 5 The compression test results of TiB+TiC/TC4 composites: a the stress–strain curves of compression tests; b variation of Ec of TiB+TiC/TC4 composites with different volume fractions of TiB+TiC

Fig. 6 Variation of elastic modulus of TiB+TiC/TC4 composites matrix with different volume fractions of TiB+TiC

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Effect of B₄C on the Microstructure and Mechanical Properties of As-Cast TiB+TiC/TC4 Composites

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