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Author:

Guo, Yanwu (Guo, Yanwu.) | Wei, Wu (Wei, Wu.) | Huang, Hui (Huang, Hui.) | Wen, Shengping (Wen, Shengping.) | Shi, Wei (Shi, Wei.) | Zhou, Xiaorong (Zhou, Xiaorong.) | Wu, Xiaolan (Wu, Xiaolan.) | Gao, Kunyuan (Gao, Kunyuan.) | Rong, Li (Rong, Li.) | Qi, Peng (Qi, Peng.) | Nie, Zuoren (Nie, Zuoren.) (Scholars:聂祚仁)

Indexed by:

EI Scopus SCIE

Abstract:

In order to improve the mechanical properties of Al-Si alloys fabricated by selective laser melting process, the microstructure and mechanical properties of Er/Zr modified A357 (Al-7Si-0.6 Mg) alloy in as-built and stress relief annealing conditions were studied. The re-sults show that adding 0.15 wt.% Er helps to refine the cellular size, which is formed by eutectic Si network. The (Al,Si)3(Er,Zr) phases were precipitated during the solidification of Er-Zr composite modified sample, which could act as inoculants to promote the formation of equiaxed grains and refine the grain size. The average grain size of 0.8Er-0.4Zr sample was only 3.1 +/- 1.4 mm. The yield strength, tensile strength and elongation reached 333 +/- 2 MPa, 454 +/- 1 MPa and 12.5 +/- 1%, respectively. After stress relief annealing, eutectic Si was spheroidized and its size was increased, resulting in a decrease of strength and an increase of elongation. At the same time, the nano-sized L12-structure particles were precipitated in the Er-Zr composite modified sample, which would make up for the loss of strength and level it up to a certain extent. Therefore, Er-Zr composite modification could be an effective method to improve the comprehensive mechanical properties of SLM processed Al-Si alloys. (c) 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Keyword:

Er-Zr composite Modification Selective laser melting A357 alloy Mechanical properties Stress relief annealing

Author Community:

  • [ 1 ] [Guo, Yanwu]Beijing Univ Technol, Key Lab Adv Funct Mat, Educ Minist China, Beijing 100124, Peoples R China
  • [ 2 ] [Wei, Wu]Beijing Univ Technol, Key Lab Adv Funct Mat, Educ Minist China, Beijing 100124, Peoples R China
  • [ 3 ] [Huang, Hui]Beijing Univ Technol, Key Lab Adv Funct Mat, Educ Minist China, Beijing 100124, Peoples R China
  • [ 4 ] [Wen, Shengping]Beijing Univ Technol, Key Lab Adv Funct Mat, Educ Minist China, Beijing 100124, Peoples R China
  • [ 5 ] [Wu, Xiaolan]Beijing Univ Technol, Key Lab Adv Funct Mat, Educ Minist China, Beijing 100124, Peoples R China
  • [ 6 ] [Gao, Kunyuan]Beijing Univ Technol, Key Lab Adv Funct Mat, Educ Minist China, Beijing 100124, Peoples R China
  • [ 7 ] [Rong, Li]Beijing Univ Technol, Key Lab Adv Funct Mat, Educ Minist China, Beijing 100124, Peoples R China
  • [ 8 ] [Qi, Peng]Beijing Univ Technol, Key Lab Adv Funct Mat, Educ Minist China, Beijing 100124, Peoples R China
  • [ 9 ] [Nie, Zuoren]Beijing Univ Technol, Key Lab Adv Funct Mat, Educ Minist China, Beijing 100124, Peoples R China
  • [ 10 ] [Shi, Wei]Swiss Fed Inst Technol, Inst Bldg Mat, CH-8093 Zurich, Switzerland
  • [ 11 ] [Zhou, Xiaorong]Univ Manchester, Sch Mat, Manchester M13 9PL, England

Reprint Author's Address:

  • [Wei, Wu]Beijing Univ Technol, Key Lab Adv Funct Mat, Educ Minist China, Beijing 100124, Peoples R China;;[Nie, Zuoren]Beijing Univ Technol, Key Lab Adv Funct Mat, Educ Minist China, Beijing 100124, Peoples R China;;

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Source :

JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T

ISSN: 2238-7854

Year: 2023

Volume: 22

Page: 1625-1637

6 . 4 0 0

JCR@2022

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count: 10

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 1

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