Influence of Multi-pass Friction Stir Processing on Microstructure and Mechanical Properties of Die Cast Al-7Si-3Cu Aluminum Alloy

被引：23

作者：

Baruch, L. John ^{[1
]}

Raju, R. ^{[2
]}

Balasubramanian, V. ^{[3
]}

Rao, A. G. ^{[4
]}

Dinaharan, I. ^{[5
]}

机构：

[1] Madanapalle Inst Technol & Sci, Dept Mech Engn, Madanapalle 517325, Andhra Pradesh, India

[2] Anna Univ, Coll Engn, Dept Ind Engn, Madras 600025, Tamil Nadu, India

[3] Annamalai Univ, Ctr Mat Joining & Res CEMAJOR, Dept Mfg Engn, Chidambaram 608002, Tamil Nadu, India

[4] Naval Mat Res Lab, Marine Mat Div, Thana 421506, Maharashtra, India

[5] Univ Johannesburg, Dept Mech Engn, Auckland Pk Kingsway Campus, ZA-2006 Johannesburg, South Africa

来源：

ACTA METALLURGICA SINICA-ENGLISH LETTERS | 2016年 / 29卷 / 05期

关键词：

Friction stir processing; Overlap multi-pass; Microstructure; Mechanical properties; TENSILE PROPERTIES; HEAT-TREATMENT; FATIGUE BEHAVIOR; IMPROVEMENT; PARAMETERS;

D O I：

10.1007/s40195-016-0405-2

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The influence of overlap multi-pass friction stir processing on the microstructure and the mechanical properties, in particular, strength, ductility and hardness of die cast Al-7Si-3Cu aluminum alloy was investigated. It was observed that increase in the number of overlap passes friction stir processing resulted in significant refinement and redistribution of aluminum silicon eutectic phase and elimination of casting porosities. The microstructural refinement by the friction stir processing not only increases the ultimate tensile strength from 121 to 273 MPa, but also increases the ductility as observed by the increase in fracture strain from 1.8% to 10%. Analysis of the fractured surface reveals that the microstructural refinement obtained by friction stir processing plays a vital role in transforming the fracture mode from completely mixed mode to the ductile mode of the fracture with increasing number of passes. The change in the size, shape, morphology and distribution of eutectic silicon particles and elimination of the porosities are the main reasons for the increases in tensile strength and ductility due to friction stir processing.

引用

页码：431 / 440

页数：10

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