添加不同稀土元素對A356鋁合金機械性質之可靠度分析

Reliability Analysis of Different Rare Earth Elements on the Mechanical Properties of A356 Aluminum Alloys

黃立仁(Lih-Ren Hwang) ； 胡浚銘(Jyun-Ming Hu) ； 朱正民(Chang-Min Chu) ； 吳斌弘(Bin-Hong Wu)

《鑄造工程學刊》 39卷3期 (2013/09) Pp. 27-38

摘要

本研究主要在探討添加不同稀土元素對A356鋁合金機械性質及可靠度之影響，因未經調質的A356鋁合金，會形成針狀或平板狀的共晶矽，若加入調質元素，可使共晶矽的形狀轉變為纖維狀結構，而其工業中以鈉（Na）、鍶（Sr）、銻（Sb）等三種調質劑最為常用。本研究將添加釔（Y）、鈧（Sc）、鈰（Ce）、鑭（La）等四種稀土元素作為調質劑，探討不同稀土元素對鋁合金微結構、抗拉強度、延伸率、衝擊強度及硬度的影響，並對機械性質進行可靠度分析。可靠度分析結果顯示，機械性質之可靠度均屬於右偏型之分佈型態，添加微量鈰元素時，其機械性質之可靠度均較佳。

關鍵字

A356合金 ； 稀土元素 ； 可靠度

並列摘要

This study aims to discuss the effects of adding various rare earth elements on the mechanical properties and reliability of A356 aluminum alloy. As A356 aluminum alloy without modification would form needle-shaped or flat eutectic Si, adding modification elements could change the shape of eutectic Si into fiber-like texture. In this industry, sodium (Na), strontium (Sr), and antimony (Sb) are the commonly used modifiers. By adding the rare earth elements of yttrium (Y), scandium (Sc), cerium (Ce), and lanthanum (La) as the modifiers, this study tends to discuss the effects of rare earth elements on the microstructure, tensile strength, elongation, impact strength, and hardness, as well as to proceed reliability analyses of the mechanical properties. The reliability analysis presents that the reliability of mechanical properties appears skew-to-right distribution that the reliability of mechanical properties would be favorable when adding slight cerium.

並列關鍵字

A356 aluminum alloy ； Rare earth elements ； Reliability