Next Article in Journal
Novel Research for Development of Shape Memory Alloys
Previous Article in Journal
Evolution of Microstructure and Mechanical Properties of a CoCrFeMnNi High-Entropy Alloy during High-Pressure Torsion at Room and Cryogenic Temperatures
Article Menu
Issue 2 (February) cover image

Export Article

Open AccessArticle

Effects of Zr Additive on Microstructure, Mechanical Properties, and Fractography of Al-Si Alloy

Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
*
Author to whom correspondence should be addressed.
Metals 2018, 8(2), 124; https://doi.org/10.3390/met8020124
Received: 8 January 2018 / Revised: 2 February 2018 / Accepted: 6 February 2018 / Published: 10 February 2018
  |  
PDF [5785 KB, uploaded 10 February 2018]
  |  

Abstract

The effects of Zr additive on the microstructure, mechanical properties, and fracture behavior of Al-Si alloy were systematically investigated. The additive of Zr obviously reduced the size of Si particles and changed its morphology. Grain size refinement was promoted by the reaction between Al and Zr forming Al3Zr and ZrSi2 compounds. Compared to a Zr-free alloy, the additive enhanced the tensile strength, compressive strength, shear strength, and hardness. The optimized Zr content was 2.4 wt % corresponding to a tensile strength of 231.1 MPa, compressive strength of 343.1 MPa, shear strength of 174.9 MPa, and hardness of 85.5 HV, greater than those of the Zr-free alloy. This illustrates that fine-grain strengthening and the existence of a second phase can improve the mechanical properties of Al-Si alloy. The fracture surface of Al-Si alloy without Zr additive showed a brittle fracture mode and there were no pits on the fractured surface. In the presence of Zr addictive, a typical plastic deformation with a large amount of pits was evidenced. View Full-Text
Keywords: Al-Si alloy; hot isostatic pressing (HIP); microstructure; mechanical properties; fracture mechanism Al-Si alloy; hot isostatic pressing (HIP); microstructure; mechanical properties; fracture mechanism
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Qian, H.; Zhu, D.; Hu, C.; Jiang, X. Effects of Zr Additive on Microstructure, Mechanical Properties, and Fractography of Al-Si Alloy. Metals 2018, 8, 124.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Metals EISSN 2075-4701 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top