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Journal of Materials Engineering and Performance

, Volume 25, Issue 8, pp 3538–3545 | Cite as

Effect of La2O3 Nanoparticles on the Brazeability, Microstructure, and Mechanical Properties of Al-11Si-20Cu Alloy

  • Ashutosh Sharma
  • Myung Hwan Roh
  • Jae Pil Jung
Article

Abstract

The Al-11Si-20Cu brazing alloy and its ex situ composite with the content ranging from 0.01 to 0.05 wt.% of La2O3 are produced by electromagnetic induction-cum-casting route. The brazeability of the alloy and composite samples are tested using the spreading technique according to JIS Z-3197 standard. The mechanical properties such as filler microhardness, tensile shear strength, and elongation of the brazed joints are evaluated in the as-brazed condition. It is reported that incorporation of an optimal amount of 0.05 wt.% of hard La2O3 nanoparticles in the Al-Si-Cu matrix inhibits the growth of the large CuAl2 intermetallic compounds (IMCs) and Si particles. As a consequence, the composite filler brazeability, microhardness, joint tensile shear strength, and elongation are improved significantly compared to those of monolithic Al-11Si-20Cu alloy.

Keywords

aluminum automotive and transportation brazing composites joining metallic matrix nanomaterials thermal analysis 

Notes

Acknowledgments

This work was supported by the Energy Efficiency & Resources Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) financial resource grant from the Ministry of Trade, Industry & Energy, Republic of Korea (No. 20142020104380).

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Copyright information

© ASM International 2016

Authors and Affiliations

  • Ashutosh Sharma
    • 1
  • Myung Hwan Roh
    • 1
  • Jae Pil Jung
    • 1
  1. 1.Department of Materials Science and EngineeringUniversity of SeoulSeoulSouth Korea

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