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Terfenol-D
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<p>Terfenol-D, an <a href="/facts/Alloy/I7w7WQWR">alloy</a> of the formula <a href="/facts/Terbium/ICF3PMED">Tb</a><i>x</i><a href="/facts/Dysprosium/eMev6zGS">Dy</a>1−<i>x</i><a href="/facts/Iron/DkICCKIC">Fe</a>2 (<i>x</i> ≈ 0.3), is a <a href="/facts/Magnetostriction/hkma4mTU">magnetostrictive</a> material. It was initially developed in the 1970s by the <a href="/facts/Naval_Ordnance_Laboratory/yPDCvdcT">Naval Ordnance Laboratory</a> in the United States. The technology for manufacturing the material efficiently was developed in the 1980s at <a href="/facts/Ames_Laboratory/zwwxY36t">Ames Laboratory</a> under a U.S. Navy-funded program. It is named after <a href="/facts/Terbium/ICF3PMED">terbium</a>, <a href="/facts/Iron/DkICCKIC">iron</a> (Fe), <a href="/facts/Naval_Ordnance_Laboratory/yPDCvdcT">Naval Ordnance Laboratory</a> (NOL), and the D comes from <a href="/facts/Dysprosium/eMev6zGS">dysprosium</a>. </p>