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彈(dan)(dan)(dan)性(xing)合(he)金(jin)是精 密合(he)金(jin)的(de)一類，用于制(zhi)作(zuo)精 密儀(yi)器儀(yi)表(biao)中(zhong)彈(dan)(dan)(dan)性(xing)敏(min)感元(yuan)(yuan)件、儲能(neng)元(yuan)(yuan)件和頻(pin)率元(yuan)(yuan)件等彈(dan)(dan)(dan)性(xing)元(yuan)(yuan)件。除了具有良好(hao)(hao)的(de)彈(dan)(dan)(dan)性(xing)性(xing)能(neng)之(zhi) 外(wai)，還(huan)具有無磁性(xing)、微塑性(xing)變形抗(kang)力高、硬度(du)高、 電阻率低(di)、彈(dan)(dan)(dan)性(xing)模量(liang)溫(wen)度(du)系數小、內(nei)耗(hao)小等性(xing)能(neng)。 彈(dan)(dan)(dan)性(xing)合(he)金(jin)包括(kuo)高彈(dan)(dan)(dan)性(xing)合(he)金(jin)和恒彈(dan)(dan)(dan)性(xing)合(he)金(jin)。前者彈(dan)(dan)(dan)性(xing) 高，滯(zhi)彈(dan)(dan)(dan)性(xing)效應低(di)，耐(nai)熱性(xing)好(hao)(hao);后者在(zai)(zai)一定溫(wen) 度(du)范(fan)圍內(nei)彈(dan)(dan)(dan)性(xing)模量(liang)幾乎(hu)不(bu)隨溫(wen)度(du)變化，又稱(cheng)為“艾(ai) 林瓦 (Elinvar) 合(he)金(jin)”。彈(dan)(dan)(dan)性(xing)合(he)金(jin)一般在(zai)(zai)真(zhen)空(kong)中(zhong) 冶(ye)煉，半成品(pin)或(huo)成品(pin)亦(yi)多在(zai)(zai)真(zhen)空(kong)或(huo)保護性(xing)氣氛中(zhong)進 行熱處理。