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2017 Vol.27, Issue 10 Preview Page
Influence of Sr and TiB on the Microstructure and Eutectic Temperature of Al-12Si Die-Cast Alloys

Sr과 TiB 첨가에 따른 다이캐스팅용 Al-Si 합금의 미세조직과 공정온도의 변화

Yong-Lak Choi1
,
Seon-Hwa Kim1†
,
Dong-Hyun Kim2
,
Sang-Il Yoon2
,
Ki-Sun Kim2†
최 용락1
,
김 선화1†
,
김 동현2
,
윤 상일2
,
김 기선2†
1Department of Advanced Materials Engineering, Soonchunhyang University, Asan 31538, Republic of Korea
2Samkee Automotive, Pyeongtaekhang-ro 268 beon-gil, Poseung-eup, Pyeongtaek-si, Gyeonggi-do 17953, Republic of Korea
1순천향대학교 디스플레이신소재공학과
2(주)삼기오토모티브
†Corresponding author seonhwa@sch.ac.kr (S.-H. Kim, Soonchunhyang Univ.) kskim@samkee.com (K.-S. Kim, Samkee Automotive Co.)
October 2017. pp. 544-551
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Abstract

In order to develop a new commercial Al-12%Si casting alloy with improved physical properties, we investigated the effect of adding Sr and TiB to the alloy. Al-12%Si alloys were prepared by die casting at 660 °C. The eutectic temperature of the Sr-modified Al-12%Si alloy decreased to 9 °C and the mushy zone region increased. The shape of the Si phase changed from coarse acicula to fine fiber with the addition of Sr. The addition of TiB in the Al-12%Si alloy reduced the size of the primary α-Al and eutectic Si phases. When Sr and TiB were added together, it worked more effectively in refinement and modification. The density of twins in the Si phase-doped Sr increased and the width of the twins was refined to 5 nm. These results are related to the impurity induced twinning(IIT) growth.

Keywords
Al-12Si alloy
die-casting
twin
eutectic Si
TPRE
IIT
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 27
  • No :10
  • Pages :544-551
  • Received Date : 2017-07-26
  • Revised Date : 2017-09-05
  • Accepted Date : 2017-09-14
  • DOI :https://doi.org/10.3740/MRSK.2017.27.10.544
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