Microstructure and Mechanical Properties of as Cast and Heat-treated Al-Si-Cu-Ni-Ce-Cr

doi:10.11901/1005.3093.2018.693

Chinese Journal of Materials Research

2019, Vol. 33

Issue (8): 588-596 DOI: 10.11901/1005.3093.2018.693

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Microstructure and Mechanical Properties of as Cast and Heat-treated Al-Si-Cu-Ni-Ce-Cr

Tianyou ZHAO,Erjun GUO,Yicheng FENG(

),Sicong ZHAO,Yuanke FU,Liping WANG

School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China

Cite this article:

Tianyou ZHAO, Erjun GUO, Yicheng FENG, Sicong ZHAO, Yuanke FU, Liping WANG. Microstructure and Mechanical Properties of as Cast and Heat-treated Al-Si-Cu-Ni-Ce-Cr. Chinese Journal of Materials Research, 2019, 33(8): 588-596.

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Abstract

The microstructure and mechanical properties of Al-Si-Cu-Ni-Ce-Cr alloy after different heat treatment were investigated by optical microscope, scanning electron microscope, X-ray diffraction and universal tensile testing. Results show that the θ-Al₂Cu phase completely dissolved into the matrix and the γ-Al₇Cu₄Ni and most of the δ-Al₃CuNi phases dissolved into the matrix after two steps solution treatment. When the Al-Si-Cu-Ni-Ce-Cr alloy was treated by 490°C×2 h+520°C×2 h+185°C× 6 h, the ultimate tensile strength at room temperature and 300°C is 336.8 MPa and 153.3 MPa, respectively. Compare with the as-cast Al-Si-Cu-Ni-Ce-Cr alloy, the value of tensile strength at room temperature and 300°C increases 74% and 19.3%, respectively.

Key words: metallic material microstructure mechanical property heat-resistant aluminum solid solution treatment ageing treatment

Received: 06 December 2018

ZTFLH:

TG146.2

Fund: Supported by Foundation:Natural Science Foundation of Heilongjiang Province of China(Nos. ZD2016011);Supported by Foundation:Natural Science Foundation of Heilongjiang Province of China(Nos. E2018045)

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	Tianyou ZHAO
	Erjun GUO
	Yicheng FENG
	Sicong ZHAO
	Yuanke FU
	Liping WANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.693 OR https://www.cjmr.org/EN/Y2019/V33/I8/588

Table 1 Nominal chemical composition of Al-Si-Cu-Ni-Ce-Cr alloy (%， mass fraction)

Fig.1 Schematic diagram of tensile sample (unit: mm)

Fig.2 Optical microstructure of alloy in different states (a) as cast, (b) 490℃×4 h, (c) 490℃×2 h+520℃×2 h, (d) 490℃×4 h +185℃×6 h, (e) 490℃×2 h+520℃×2 h+185℃×6 h

Table 2 Energy spectrum analysis of marked area in Fig.3 and Fig.4 (%， atomic fraction)

Fig.3 SEM images of as-cast alloy

Fig.4 XRD analysis of alloys in different states (a) as-cast, (b) 490℃×4 h, (c) 490℃×2 h+520℃×2 h, (d) 490℃×4 h+185℃×6 h, (e) 490℃×2 h+520℃×2 h+185℃×6 h

Fig.5 SEM images of alloy treated by solid solution (a) and (b) 490℃×4 h, (c) and (d) 490℃×2 h+520℃×2 h

Fig.6 SEM images of alloy treated by aging (a) and (b) 490℃×4 h+185℃×6 h, (c) and (d) 490℃×2 h+520℃×2 h+185℃×6 h

Fig.7 Ce distribution in as-cast alloy (a) SEM image in as-cast alloy，(b) Ce distribution

Fig.8 Ce distribution in sample after solution treatment (a) SEM image at solution treatment、(b) The Ce distribution

Fig.9 Ce distribution in sample after aging treatment (a) SEM image at aging treatment、(b) Ce distribution

Fig.10 The tensile strength of alloy at room temperature and high temperature in different states

Fig.11 Tensile fracture morphology of sample tested at room temperature (a) as-cast, (b) 490℃×4 h+185℃×6 h, (c) 490℃×2 h+520℃×2 h+185℃×6 h

Fig.12 Tensile fracture morphology of alloy tested at high temperature (a) as-cast, (b) 490℃×4 h+185℃×6 h, (c) 490℃×2 h+520℃×2 h+185℃×6 h

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