PREPARATION AND MECHANICAL PROPERTIES OF Zr46.9Cu45.5Al5.6Y2.0 IN SITU BMG COMPOSITES WITH B2-CuZr PHASE

doi:10.11900/0412.1961.2015.00140

Acta Metall Sin

2015, Vol. 51

Issue (11): 1407-1415 DOI: 10.11900/0412.1961.2015.00140

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PREPARATION AND MECHANICAL PROPERTIES OF Zr_46.9Cu_45.5Al_5.6Y_2.0 IN SITU BMG COMPOSITES WITH B2-CuZr PHASE

Yong SHEN(

),Jian XU

Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

Cite this article:

Yong SHEN,Jian XU. PREPARATION AND MECHANICAL PROPERTIES OF Zr_46.9Cu_45.5Al_5.6Y_2.0 IN SITU BMG COMPOSITES WITH B2-CuZr PHASE. Acta Metall Sin, 2015, 51(11): 1407-1415.

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Abstract

Bulk metallic glass (BMG) composites containing B2-CuZr phase are of interest due to they behave large plastic strain and apparent work hardening in tension. Nevertheless till now most BMG composites containing B2-CuZr phase are based on Cu_47.5Zr_47.5Al₅ or Zr₄₈Cu_47.5Al₄Co_0.5 BMG, which has limited glass forming ability (GFA). The prepared sample size is small, which restricts their potential engineering structural applications. In this work, Zr-Cu-Al-Y quaternary system is selected due to its high GFA. By tuning composition close to CuZr alloy in Zr-Cu-Al-Y quaternary system, Zr_46.9Cu_45.5Al_5.6Y_2.0 BMG is selected because it has proper GFA (critical diameter D_c=5 mm) and relatively large fracture toughness (K_Q=(49±3) MPam^1/2). By decreasing the cooling rates of the melt via increasing diameter of casting rods, large-sized in situ Zr_46.9Cu_45.5Al_5.6Y_2.0 BMG composites containing 13% and 25% volume fractions spherical B2-CuZr phase were prepared in the casting rods with 6 and 7 mm in diameters, respectively. In compression testing, the in situ BMG composites containing 25%B2-CuZr phase promote multiple shear bands within glass matrix and remarkable global plastic deformation, accompanied by a large compressive plastic strain as 6.5%. Nevertheless in tension testing no obvious global ductility was achieved, which attributes to the low mode I fracture toughness and small plastic zone size (R_P=88 mm, R_P=(1/3π)(K_Q/s_y)² ) of glass matrix. Three point bending test results show that Y has an adverse effect on the fracture toughness and plastic zone size of Zr-Cu-Al BMGs. In contrast to Zr_46.9Cu_45.5Al_5.6Y_2.0 BMG, fatigue pre-cracked Zr₄₈Cu₄₅Al₇ BMG plate samples can be prepared and exhibit a high fracture toughness (K_Q=(62±3) MPam^1/2) and a large plastic zone size (R_P=150 mm) in plane strain state. Our results show that GFA and fracture toughness of glass matrix should be balanced when designing new BMG composites containing B2-CuZr phase.

Key words: bulk metallic glass composite B2-CuZr fracture toughness

Fund: Supported by National Natural Science Foundation of China (No.51171180)

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https://www.ams.org.cn/EN/10.11900/0412.1961.2015.00140 OR https://www.ams.org.cn/EN/Y2015/V51/I11/1407

Fig.1 Illustration of out strategy of designing Zr-Cu-Al-Y in situ bulk metallic glass (BMG) composites with B2-CuZr compound (Zr_44.4Cu₄₂Al₁₀Y_3.6 (Y1) alloy is marked as a star)^[27]

Fig.2 Illustration of inner structure of as-cast rods with different diameters of (Cu_0.5Zr_0.5)_xM₁₀₀_-_x (M=Zr_0.15Y_0.225Al_0.625, 84≤x≤94) series alloys (Y1—Zr_44.4Cu₄₂Al₁₀Y_3.6, Y_C—Zr_46.9Cu_45.5Al_5.6Y_2.0)

Fig.3 OM images of central portion of in situ Y_C BMG composites with 6 mm (a) and 7 mm (b) in diameters

Fig.4 XRD spectra of the inner portion of Y_C cast rods with 6, 7 and 8 mm in diameters

Fig.5 DSC curves of Y_C fully glassy rod with 5 mm in diameter and Y_C BMG composites rods with 6 and 7 mm in diameters (T_g—glass transition temperature)

Table 1 T_g, heat of crystallization ΔH and volume fractions V_f of B2-CuZr of casting rods with different diameters of Zr_46.9Cu_45.5Al_5.6Y_2.0 alloy

Fig.6 Compressive engineering stress-strain curves of monolithic Zr_47.2Cu₄₆Al₅Y_1.8 BMG^[27] and the in situ Y_C BMG composites with 25%B2-CuZr phase

Fig.7 Tensile engineering stress-strain curves of Y_C BMG composites with 25%B2-CuZr phase (a) and tensile stress-strain curve of the specimen marked with an arrow in Fig.7a (b)

Fig.8 SEM images of fractured tension sample of Y_C BMG composites with 25%B2-CuZr phase

(a) side view of fractured sample

(b) high-magnification image of the block area in Fig.8a

(d~f) high-magnification images of the block areas marked with 1, 2 and 3 in Fig.8c, respectively.

Table 2 Three-point bending test results of fatigue pre-carcked Zr₄₈Cu₄₅Al₇ BMG samples

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