New Possibilities for High Strength Aluminum
A206 aluminum may be a viable alloy for permanent mold castings traditionally cast in green sand.
YEMI FASOYINU, CANMET MATERIALS, HAMILTON, ONTARIO, CANADA; DAVID WEISS, ECK INDUSTRIES INC., MANITOWOC, WISCONSIN; AND JITEN SHAH, PRODUCT DEVELOPMENT & ANALYSIS LLC, NAPERVILLE, ILLINOIS
高强铝合金工艺技术可能有新的发展 通常采用湿砂工艺铸造的铝合金A206，可能也适用于金属型铸造。
Yemi FasoYinu，加拿大安大略省哈密尔顿 Canmet材料公司；DaviD Weiss，威斯康辛州马尼托沃克eCk工业公 司；Jiten shah，伊利诺伊州内伯威尔市产品开发和分析公司。
T
he U.S. Department of Energy funded a number of proposals in 2004 under the Energy Sav- ing Melting and Revert Reduction Technology (E-SMARRT) program, which included a proj-
ect lead by Canmet Materials (CMAT), Hamilton, Ontario, Canada, on permanent mold casting light metal alloys. CMAT focused specifically on alloys that were considered difficult to pour in a permanent mold but offered significant energy savings by reducing revert (or returns). A206 is one of the highest strength structural alloys.
Yield strengths in excess of 45 ksi are routinely achieved in the T71 temper. It has very good high temperature proper- ties with little reduction in strength up to 350F (177C), making it an ideal alloy for cylinder heads and other elevated temperature applications. When poured into a permanent mold, however, A206 has a tendency for hot tearing, which is caused by thermal contraction in the late stages of solidification. Because of this difficulty, A206 most often is cast in green or chemi- cally bonded sand molds. A recent research project aimed to establish processing parameters for A206 in permanent mold castings that prevent hot tearing for structural components in automotive and other applications.
2
004年，美国能源部资助了多项有关节能熔 炼和减少回料技术（E-SMARRT）的项目， 其中包括由加拿大安大略的Canmet材料公司
(CMAT)牵头的金属型轻合金铸造项目。CMAT特别关 注难以用金属型铸造但可因减少回炉料而显著节能的 合金材料。
A206是一种强度最高的结构用合金。经T71热处理 后，其屈服强度一般可达45 ksi (310MPa)以上。在350 F (177C)以下，高温性能很好，使其成为气缸盖和其他 高温用途的理想合金材料。
然而，在金属型铸造时，A206有因凝固后期的收缩 而产生热裂的倾向。因此，A206合金通常都采用湿砂 型铸造或化学粘结砂型铸造。最近一项研究课题的目标 就是：为防止汽车和其他用途的结构铸件中出现热裂， 而确立有关A206合金金属型铸造的工艺参数。
克服采用模拟技术的障碍 采用200系列铝铜合金对控制化学成分的要求比采用
Fig. 1. The bracket casting was selected because its geometry was typical of struc- tural components.
图1：选择支架铸件的原因 是它具有典型的结构铸件几 何形状。
March 2015
FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION | 41
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