Effects of Sr and Ultrasound on Solidified Structure and Mechanical Properties of Iron-rich A356 Alloy

CHEN Zhitang; ZHOU Quan; PENG Jiahui; PAN Junlin

doi:10.15980/j.tzzz.T20240013

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Effects of Sr and Ultrasound on Solidified Structure and Mechanical Properties of Iron-rich A356 Alloy
Vol. 45, Issue 2, Pages: 279-286(2025)
Received：15 January 2024，

Revised：29 February 2024，

Published：20 February 2025
DOI： 10.15980/j.tzzz.T20240013
稿件说明：

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陈志堂，周全，彭家辉，等. Sr和超声对富铁A356合金凝固组织及力学性能的影响［J］. 特种铸造及有色合金，2025，45（2）：279-286. DOI： 10.15980/j.tzzz.T20240013.

CHEN Z T，ZHOU Q，PENG J H，et al. Effects of Sr and ultrasound on solidified structure and mechanical properties of iron-rich A356 alloy［J］. Special Casting & Nonferrous Alloys，2025，45（2）：279-286. DOI： 10.15980/j.tzzz.T20240013.

摘要

利用OM、SEM、EDS、XRD、布氏硬度计及拉伸试验机等手段，研究了Sr和超声处理对富铁A356合金凝固组织及力学性能的影响。结果表明，Sr和超声处理均可以有效细化合金初生晶粒、共晶Si相和富Fe相并提高其力学性能；与未处理合金相比，复合处理合金的针状富Fe相长度减小了66%，其布氏硬度、抗拉强度和伸长率分别提高了23.1%、43.5%和120.3%；复合处理条件下，在0~900 W范围内，随着超声功率提高，合金的初生晶粒和共晶Si相逐渐细化，针状富Fe相尺寸逐渐减小；在0~90 s内，随着超声处理时间增加，合金的初生晶粒和共晶Si相先细化后粗化，针状富Fe相尺寸先减小后增大，转折点均为60 s。富铁A356合金的力学性能与其凝固组织基本对应，合金的初生晶粒、共晶Si相及富Fe相越细小，其拉伸性能和硬度越高。

Abstract

Effects of Sr and ultrasound on solidified structure and mechanical properties of iron-rich A356 alloy were investigated by OM， SEM， EDS， XRD， Brinell hardness tester and tensile tester. The results indicate that Sr and ultrasonic treatment can effectively refine primary grain， eutectic Si phase and iron-rich phase and improve mechanical properties of the alloy. Compared with that of untreated alloy， the length of needle-like iron-rich phase of the composite treated alloy is decreased by 66%， and Brinell hardness， tensile strength， and elongation are increased by 23.1%， 43.5%， and 120.3%， respectively. Under the compound treatment condition， in the range of 0~900 W， grains and eutectic Si phase in the alloy are refined gradually with the increase of processing power，and size of the iron-rich phase is reduced gradually. In the range of 0~90 s， with the ultrasound progressing， grains and eutectic Si phase in the alloy are refined at first and then coarsened and size of the iron-rich phase is decreased at first and then increased with the turning points of 60 s. The mechanical properties of iron-rich A356 alloy are directly retated with solidified structure. With decreasing in the grain size， eutectic Si phase and iron-rich phase of the alloy， the tensile properties and hardness are improved.

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references

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